WHO KILLED MARY BETH HEINZ?

According to https://it.findagrave.com/memorial/162370708/mary-beth-heinz, Mary Beth Heinz was a girl who suffered from epilepsy who resided at 51 Holly Avenue in Mineola and who was kidnapped near the bus stop bus on May 5, 1972. The victim was found dead on May 10, 1972 in a creek in a wooded area between Peninsula Boulevard and Maine