yes. he looked at everything. i was even like, where was ted 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 is real. 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 budding journalist 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 light. here s josh mankiewicz with a promise to helene . 40 years is a long time. that s 40 winters here in colorado. and countless snowfalls. it was on