|“||How would we explain why we were together at Sweetwater River at 6:00 A.M. on the Fourth of July? And you're right. We didn't say anything. We're both going to have to live with that choice. Do you understand? I think you should pursue your music, but not with me.||”|
|— Ms. Grundy to Archie[src]|
Geraldine was a music teacher at Riverdale High School who began an affair with an underage student, Archie Andrews. After she was exposed for committing statutory rape, Geraldine quit her job and was forced to leave Riverdale.
She later took up residence in the town of Greendale, located on the opposite side of Sweetwater River, and continued to teach music. After a private music lesson with Ben Button, one of her students, who she was having another inappropriate relationship with, the Black Hood broke into her house without her knowing and strangled her to death from behind with a cello bow.
At some point during her life, Geraldine Grundy learned to play the cello, becoming quite skilled in her own right and loved to perform. Before moving to Riverdale, Geraldine was in an abusive marriage with an aggressive husband who would come home drunk every night. One night, he came home so drunk and angry that she ended up in the ER with broken ribs and a shattered collarbone. The next day, he had no memory of the incident and he promised it wouldn't happen again, but it did, so she left him, got a divorce, changed her name, then moved to Riverdale. It should be noted that the real Geraldine Grundy was an elderly woman who passed away in 2010. It wasn't until six years later that her name was assumed by Jennifer Gibson, who was fleeing from her abusive ex-husband.
Upon her move, she became a music teacher at Riverdale High School and, on two occasions, she gave independent studies to two students, namely Tomoko Yoshido and Jason Blossom, the latter she called an inspiration. During the summer of 2017, she had a romantic relationship with one of her students, Archie Andrews, and both embarked on a secret relationship. On July 4th, Geraldine and Archie both hear a gunfire go off at Sweetwater River at the time of Jason Blossom's disappearance.
During the assembly being held by Cheryl Blossom, Geraldine looked back at Archie Andrews as he sat in the crowd, remembering their time spent together during the summer, in which they had a lengthy romantic relationship. Archie later approached Geraldine, asking for her help in making his music. She was hesitant, but eventually agreed to assist him. Later that day, it is revealed that both heard a gunshot on the 4th of July during Jason Blossom's disappearance-turned-murder investigation. However, she refuses to tell the police as it would expose her scandalous affair with one of her students. 
Geraldine is paid a surprise, late-night visit by Archie, whose conscience is eating away at him. They both heard the gunshot on July 4th, at Sweetwater River. Geraldine assured Archie that they don't know any more than the police, which is that a gun was fired, and Jason is dead, they don't know by whom though. Archie believed telling them would be of help, as that's something the police aren't aware of, however, Geraldine is not up for negotiating. She reminded him that both of their lives could be ruined if people find out about them.
Matters only get worse, as Archie is questioned by Mr. Weatherbee, he didn't say anything about being with Miss Grundy, but if what they have isn't real, then he doesn't know what he's protecting. Geraldine insisted that their relationship is real, so much so that she's putting herself in Archie's hands.
At the Pep Rally later that week, Archie approached Geraldine to inform her that he's going to tell Sheriff Keller and Weatherbee about the gunshot he heard on July 4th. Geraldine urged him to slow down and think it through, but he had already made up his mind that he's going to do it the next day. If she wanted to join him, then they could figure it, if not, he respected that, and he'll do everything in his power to keep her out of it. He apologized for breaking his promise to stay quiet, but its something he had to do.
Geraldine and Archie arranged another one of their meetings, they discussed why Archie would tell the authorities about the gunshot, he did so hoping that it would help Cheryl, as they were going to interrogate her. However, by helping Cheryl, he put himself and Geraldine at risk. Archie attempted to downplay the situation but it is far more serious than he's aware. Geraldine explained that Sheriff Keller could go digging even further, that would lead to the exposure of their relationship. Realizing that she's inching closer to being found out, Geraldine decided it was best to suspend their lessons for the time being. She would then attend the Taste of Riverdale, where she ran into Fred Andrews, Archie father. Fred told her how often Archie spoke highly of her. He then explained that he wanted to be supportive, but he first needed to know if Archie has the talent to match his passion, Geraldine assured him that the talent is there, unquestionably. 
Archie and Fred Andrews sat in on Geraldine's graceful cello performance. Afterwards, they congratulated her on the beautiful performance, even gifting her with flowers. She thanked them both for coming. In a show of gratitude, for all she's done for Archie, Fred offered to take her out to dinner, the three of them ended up at the diner.
The next day at school, Ms. Grundy agreed to be interviewed by Betty Cooper, as the Blue and Gold was doing a series of articles, spotlighting the teaching staff. Betty asked her a number of questions, everything from the previous schools she worked at, to her independent study with Archie, and whether or not she had ever done that before. Grundy revealed that she had done that with two other students, Tomoko Yoshido and Jason Blossom.
Afterwards, Geraldine and Archie spent the night watching old movies and talking, Archie wanted to know more about her. Teaching wasn't always Geraldine's passion, it was performing, following her graduation, Geraldine auditioned at all the major symphonies, however, she never made the cut, and that was the end of that dream. Archie questioned if what they had was a dream, to which she replied, if it was, it's a good dream, then the two of them began to kiss.
Archie returned to her home the next day, with one question in mind, if her real name was Jennifer Gibson, Geraldine admitted this to be true. She was in an abusive marriage, her aggressive husband would come home drunk, every night. One night, she ended up in the ER with broken ribs and a shattered collarbone. He promised it wouldn't happen again, but it did, so she left him, got a divorce, changed her name, then moved to Riverdale.
Later that night, she received a surprise visit from Archie at the school, he gave her a brand new and expensive cello bow, she believed it to be a goodbye gift, as Archie wanted to end their lessons, but he said it's a "don't forget me" gift. The two of them are interrupted as Alice Cooper, Fred Andrews and Betty barged into the music room.
They confronted Geraldine over her secret relationship, Alice insisted that they let the law take over, but Archie pleaded with them to come up with another solution. Alice refused to budge. In an effort to protect Archie, Betty claimed she would tell everyone in town that she broke into Grundy's car, stole from her, and made up the entire story. Doing this would only further perpetuate the negative belief that crazy runs in the Cooper family. In the end, they settled on Geraldine not only quitting her job at Riverdale high school, but leaving town as well. With her belongings packed, Geraldine walked towards her car, prepared to leave, but first stops to stare at two teen boys, hawking at them over her shades. 
Kissed by the Angel of Death
Upon Grundy's departure from Riverdale, it was revealed that she had relocated to Greendale, the neighboring town of Riverdale across Sweetwater River. Geraldine stood next to a new young blonde student named Ben Button as he played the piano — she was giving him a music lesson. As he was leaving her house, the two shared a kiss, before walking out the door. When she headed back to the living room, she kneeled down to pick up some music sheets that had fallen on the floor. As she stood back up, she noticed that her window was open and was suddenly attacked by the "Angel of Death" who started strangling her with the cello bow that Archie gave to her. The attacker was so strong that he was able to lift Geraldine up off the floor as he choked her, and the cello wire started cutting into her throat, causing blood to run down her body to her feet. Her body then went limp and the man threw her to the floor. 
Following her untimely death, Geraldine's body was taken to the coroner for an autopsy to be performed. Dr. Curdle discovered that she had lacerations on the neck and that her trachea had been crushed. Broken veins in her eyes and the skin tears suggested brutality. He determined Geraldine's murder to be a crime of passion. The killer wanted to feel her struggle as she died.
Geraldine was a very attractive young woman with a slim figure, pale skin, highlighted brown hair and vibrant green eyes. She wore glasses and her attire consist of skirts and blouses, the typical clothing choice you'd see with most teachers.
There was a shyness to Grundy, hesitation in her body movements and a softness in her voice. She often avoided direct eye contact as well. When she was conversing with someone, she tended to look down to the ground. Geraldine also has a very mysterious aura around her. Despite her seemingly harmless personality and appearance, Geraldine was possibly an unregistered sex offender, having engaged in sexual intercourse with Archie Andrews. Depending on the state and the age of which when they first engaged in sexual intercourse this could be statutory rape. Age of consent varies from state to state to as young as 14 to 18.
- Main article: Archie and Geraldine
Archie and Geraldine's relationship began the summer leading up to Archie's sophomore year. As Archie was working at Andrews Construction, he encountered Geraldine cruising by in her car. They engaged in an illicit affair. However, after Jason's death, they ended their relationship. As school began, Archie, consumed by guilt, began questioning if their relationship was real enough that he would lie to the Principal Weatherbee about Grundy and Archie being in the Sweetwater River that fateful morning. Grundy insisted that it was as real as ever, and that if he told the principal that they were there that morning, their illegal relationship would be revealed and that would lead to even bigger problems. Archie decided to tell principal he heard the gunshot that morning, leaving the detail of Grundy's presence with him that morning. However, matters got worse when Betty and Veronica found out that Geraldine Grundy wasn't who she said she was. Her real name was actually Jennifer Gibson. Archie confronted Grundy, to which she claimed that she was in an abusive relationship. She left him, got a divorce, changed her name, then moved to Riverdale. Archie decided that they should break up since it would be better for the both of them. He surprised her with a good-bye gift, however, their encounter didn't last long, since Alice and Fred came storming in, Betty trailing behind, after finding out about their affair and confronted them about their secret relationship. They then forced Grundy to quit her job and leave Riverdale for good, thus ending their relationship.
- Grundy was a cellist, demonstrating her prowess on several occasions.
- Her real name was Jennifer Gibson. She stole the name Geraldine Grundy from an elderly woman who died seven years prior.
- The birth date on her driver's license is Sarah Habel's actual birth date.
- After leaving Riverdale, Geraldine moved to Greendale.
- She died after being kissed. This is why the title of the episode she dies in is called “A Kiss Before Dying”.
- The elderly Geraldine Grundy that Jennifer stole her identity from is the actual Miss Grundy character from the comics.
- See also: Category:Images of Geraldine Grundy
Season 1 Screencaps