Her cruel attitude and entitled personality, coupled with decades of shady activities within the sorority, lead the Dean, Cathy Munsch, to revoke the charter.
When she writes a long and cruel missive to the other Chanels because of their failure to help her in her last attempt to kill the Dean, the media takes hold of the said letter which ruins her reputation.
She is shocked, yet he reveals she was snooping around the house when Melanie Dorkus was viciously disfigured and was found by her father meeting Pete dressed in a Red Devil costume.
After discovering that Wes is the father of the bathtub babies and she is the half-sister of Boone and the Red Devil, she forgives him and the two decide to catch or kill her siblings to protect each other.
In the fast forward to 2016, Grace and Zayday, with Hester, now run Kappa House and have regained the honour of KKT by allowing any girl to join and host fun competitions and games instead of hazing the pledges.
She was born in 1995 as Hester Doyle, the daughter of Kappa pledge Sophia, who died from blood loss after giving birth in the bathtub because of the neglect of the president and her minions.
She refers to herself as the brains of the operation and Boone as the muscle and both poured hydrochloric acid in Melanie Dorkus's tanning spray hoping it would drive Chanel over the edge to be a scapegoat by vilifying her and she turned on the deep fryer machine that burnt Ms Bean's face off.
In 2016, she is the treasurer of Kappa House and while polishing a memorial for the kids who were killed, Cathy confronts Hester about her being the killer and threatens to turn her in to the police.
Chad Radwell (Glen Powell) was an egotistical, idiotic, sexually engaged and shallow president of the Dickie Dollar Scholars fraternity and the on and off boyfriend of Chanel Oberlin.
In the first-season finale, he opens up a charity in memory of his deceased frat brothers and begins a love affair with Denise which ends briefly, after she leaves for a police operation in Quantico.
She is emotionally unstable and easily traumatized especially when her boyfriends Roger and Dodger are killed which she witnesses and the blow up of the pizza delivery guy dressed up as the Red Devil in "Dorkus".
Despite this, Denise remains hellbent on the fact that Zayday is the Red Devil after finding incriminating evidence such as a chainsaw under her bed, and tweets regarding murder.
Towards the end of 1995, she had a mental breakdown about her sister's suicide and she was sent to Palmer Asylum and grieved for three years but managed to improve and taught Hester and Boone how to be serial killers so they could conduct their revenge plan against Kappa House.
While working at the hospital, Chanel #3 starts to fall for Dr. Cassidy and finds out that he's the Green Meanie killer but she keeps it a secret because she wants him to stop killing people.
She covered the bathtub baby incident at Kappa House in 1995 by driving Bethany, Mandy and Coco in the middle of nowhere and burying Sophia Doyle's body before telling the girls to leave school immediately.
After the deaths of Jane Hollis, Cassidy and Nurse Hoffel, Cathy's money gets stolen by Hester and Dr. Brock, but she ends up selling the hospital for a huge profit and becomes a sex therapist for women over 50.
After the deaths of Jane Hollis, Cassidy, and Nurse Hoffel, Hester steals all of Cathy's money and runs away with Brock and they both buy Blood Island which they plan to kill tourists who crash their boats.
Boone went undercover at Wallace University as a gay student one year before his sister arrived, and managed to join the Dickie Dollar Scholars despite never actually having enrolled in the school.
In the following episode, he admits to #5 that he is happy that his twin died so he did not have to share everything anymore, only to be killed by being shot several times with a nail gun by the Red Devil.
He was sexually manipulated by Dean Munch to deny the fact that there was a serial killer on the loose and refused to do a full-scale investigation, but was eventually fired by Munsch due to his incompetence as a detective.
She is classified as the ringleader of the incident at Kappa House in 1995, as she forced her friends, Coco and Mandy to leave Sophia Doyle to die after giving birth.
Since she is deaf, Tiffany doesn't notice that the rest of the girls are screaming (she thinks they are singing a Taylor Swift song) until it is too late, and she ends up getting her head mowed off by the Red Devil.
The Devils are both the children of the deceased Sophia Doyle: her son Boone Clemens and her daughter Hester Ulrich (as well as Pete Martinez (who would assist)) who were both raised by Gigi Caldwell/Jess Meyer in a mental asylum after the shocking suicide of their former guardian Amy.
On March 25, 2014, Hester and Boone (under the Red Devil costume) broke into Kappa and put hydrochloric acid in Melanie Dorkus' tanning spray which resulted in her being disfigured and the incident being blamed on Chanel Oberlin who rose to power as president and would later be framed by Hester alongside her minions for the Red Devil murders once the plan was complete and throughout the events, carefully put together evidence to frame them successfully.
After her brother's murder, Hester started to don the costume and decapitated Gigi, stabbed Pete and forced a pizza delivery man to blow up Kappa which resulted in his death.
After the Green Meanie killers are killed and everyone's lives return to normal and Chanel is leaving her TV show studio a Red Devil is seen waiting in the backseat of her car.
[11][12] The Green Meanie killer wears the costume worn by Dr. Mike on the night of October 31, 1985 where he and Nurse Thomas dumped a patient's body in the toxic swamp so they could not miss out on the Halloween party that was occurring upstairs.
The killer murders Catherine Hobart by decapitating her and then kills Tyler by burning his eyes with a laser (which was intended to be used to get rid of his warts) and slitting his throat during the surgery.
Nurse Ingrid Hoffel, who is actually the sister of Agatha Bean, discovers this and confronts Cassidy about his role as the Green Meanie and offers to become the brains of the operation, while he is the muscle.
The third killer is revealed to be Wes Gardner who is plotting revenge on the Chanels after Grace was sent to a mental institution due to the trauma of the Red Devil killings and the Kappa hazing she experienced while at Wallace University.