Billy Shamir Mir, a convicted murderer suspect in over 20 elderly women's deaths, was killed in a Texas prison. He was serving life without parole for capital murder. The assailant was a cellmate, also a murderer. Shamir Mir targeted elderly women, exploiting them by posing as a health care worker or maintenance personnel. His killing spree spanned from 2016 to 2018, ending with a conviction for two murders in 2022.