Robert Johnson Manley, a 71-year-old white man, was found murdered in his San Antonio apartment in early 1981. Neighbors described him as eccentric and unemployed. He was discovered lying in his bedroom wearing only trousers and had been bludgeoned to death with a claw hammer; the bloodied hammer was left beside his body.

No suspects were identified at the scene, and the case remained unsolved for a period. Authorities later arrested 25-year-old David Villarreal in Dallas on March 10, 1981. Villarreal confessed to multiple killings spanning 1978 to 1981 and admitted to killing at least five men, including Manley; investigators said the victims were primarily gay men and that Villarreal knew the victims. Villarreal pleaded guilty to the charges and received multiple life sentences.

Does anyone have memories of Manley, his apartment building, or other details from San Antonio in that period that could add context to this case?