bundy at that time? we have to look under every stone, every pebble,. they re talking about hundreds of names. here hundreds, thousands. she is driven. her tenacity is just remarkable. i knew i was going to find him. it was a competition between him and i. your heart is pounding like, oh, my gosh. this israel. i said, i found him. i know who killed helene. hello and welcome to dateline . helene pruszynski lift by a simple philosophy, smile and make the best of everything. the betting journalist had did just that as she started a college internship in radio. then helene was murdered. the investigation led detectives into the darkest corners of the criminal world, before a groundbreaking investigative tool helped bring the killer s secret to life. here s josh mankiewicz with a promise to helene .