Heidnik also had a child with Gail Lincow, a son named Gary Jr. The child was placed in foster care soon after his birth. Heidnik had a third child with another woman, Anjeanette Davidson, who was illiterate and mentally disabled. Their daughter, Maxine Davidson, was born on March 16, 1978, and immediately placed in foster care. Shortly after Maxine's birth, Heidnik was arrested for the kidnapping and rape of Anjeanette's sister, Alberta, who had been living in an institution for the mentally disabled in Penn Township.