FILE - Accused serial killer Billy Chemirmir looks back ahead of his third trial at Frank Crowley Courts Building, Oct. 3, 2022, in Dallas. Chemirmir, who was accused of killing nearly two dozen older women and convicted in 2022 in the slayings of two, was killed Tuesday morning, Sept. 19, 2023, by his cellmate at a Texas prison, an official said. (Shafkat Anowar/The Dallas Morning News via AP, File)