NBC Dateline's recent episode, titled Deadly Obsession, was a harrowing case that spanned more than two decades.

To find out what happened to Mike and Karen, you can watch the full episode “Deadly Obsession,” available ... to this week’s episode of Talking Dateline with Andrea Canning and Keith ...

The new Dateline episode, Deadly Obsession, explores the complete investigation behind the murder of Karen Harkness and her fiance, Mike Sisco. The episode is set to be released on April 4 ...

A Kansas couple is found dead in 2002. A years-long search for the killer and three criminal trials over two decades reveal strained dynamics within one victim’s family. Andrea Canning reports ...

Listen now for free or subscribe to Dateline Premium to listen ad-free. When bad choices become a twisted tale of deadly obsession... A podcast from Dateline’s Josh Mankiewicz.

You can catch up with past Dateline episodes on Peacock right now, as well as every previously aired episode from Season 33. Most recently, in “Deadly Obsession,” which aired on April 4 ...

The episode premieres on at 10 p.m. ET/PT and 9 p.m. CT on NBC. "Deadly Obsession," the newest episode of "Dateline," follows the murder of Topeka, Kansas couple Mike Sisco and Karen Harkness.