On December 3, 1957, Maria Ridulph had been playing outdoors with a playmate when a man walked up and introduced himself. After chatting her up about her "dollies" and putting her at ease he then offered her a piggy-back ride. She was never seen alive again. Her decomposed body was found April 26, 1958.
Jack Daniel McCullough, 71, of Seattle, had been a suspect from the beginning. He was 18-years-old at the time and lived a block away from the little girl, however the case went cold after he presented a bogus alibi to police and joined the army. He also changed his name from John Tessler to Jack McCullough.
Read more.... here and here