Accused serial killer Billy Chemirmir, who has been convicted of the murders of two elderly women and charged in nearly two dozen others, listened in court this week as the families members of his victims gave impact statements. Chemirmir was convicted last week in the death of 87-year-old Mary Brooks, who he followed home from a Dallas-area Walmart in January 2018 and murdered. He had already been convicted in the murder of 81-year-old Lu Thi Harris. Chemirmir automatically received sentences of life without parole for both murders. FILE: Accused serial killer Billy Chemirmir looks back during his retrial on April 25, 2022, at Frank Crowley Courts Building in Dallas. (Shafkat Anowar/The Dallas Morning News via AP) Prosecutors detailed at trial how Chemirmir would pose as a maintenance worker to get access to seniors' homes at independent living facilities, then smother them and steal their valuables. Karen Nelson described her mother, 81-year-old Mirriam Nelson, as a "healthy and vibrant" woman who loved life. "I've spent countless hours reliving what her last moments must have been.