Jill Coit is an American ex-model, who has been married over ten times and is currently in prison at the Denver Women's Correctional Facility for murder.
Whilst renovating a bed and breakfast with her sons, she regularly visited Gerald Boggs' hardware store. Boggs married her at the age of 50, his first marriage after Coit faked a pregnancy. Boggs' brother Doug was concerned by Coit's interest in her husband's finances. He hired a private investigator, who discovered that Coit was a fraud: she had been married 11 times and had several aliases and had been involved in various financial and insurance scams. In addition she was still married to her seventh husband. Boggs annulled the marriage.
Coit began a relationship with Michael Backus, and convinced him to help her murder Boggs. Wearing a disguise (which included a false moustache) Coit murdered him using a 22-calibre pistol and a stun gun, with the assistance of Backus. She then informed her son who reported her to the police. She was found guilty of first degree murder. She is currently serving a life sentence with no possibility of parole.
William Coit, her third husband, was also shot dead in the back. She was suspected of the murder, but the police could never find sufficient evidence to charge her (and she checked herself into a mental hospital to avoid further questioning). Coit also persuaded an elderly gentleman to adopt her, and subsequently inherited his money.
She was portrayed by Bonnie Bedelia in the film Legacy of Sin. Her case was also featured on Forensic Files, American Justice, Deadly Women, Facing Evil with Candice DeLong and New Detectives.