Donald Kleeman, a 48-year-old Caucasian man, was found strangled in his Los Angeles apartment on September 9, 1989. His killing is described as part of a series of murders that targeted gay men in Los Angeles County between 1986 and 1990.

The attacker reportedly gained victims’ trust, accompanied them back to their homes and then overpowered and strangled them with items such as exercise ropes, neckties and electrical cords. Kleeman’s death is listed among other victims in that pattern, including Alfred Rowswell, Ruben Panis, Michael Allen Cates and Leo Hildebrand.

Several key questions remain: who first linked these cases together, and what evidence tied Kleeman’s murder to the same offender? If anyone knew Donald Kleeman, knew where he spent his time, or has information about his death, please share what is known with investigators.