
This episode covers the suspicious drowning of Julie Post in 1986, the investigation into her husband Ed Post, and the subsequent trial.
Ed Post discovered his wife dead in their hotel bathtub after jogging in St. Louis. The initial autopsy ruled her death accidental, but investigators had doubts due to Ed's unusual behavior and financial motives.
Evidence emerged that Ed had increased Julie's life insurance shortly before her death. Friends noted their troubled marriage, and Ed's interest in a coworker raised further suspicions.
Prosecutors conducted a second autopsy and found bruises not noted in the first. Tests on the towel ring indicated it could not have been pulled off by Julie, suggesting foul play.
Ultimately, Ed Post was convicted of first-degree murder but later pleaded guilty to second-degree murder in exchange for a reduced sentence.
Ed Post was convicted of murdering his wife Julie after suspicious circumstances and evidence emerged during the investigation.

This episode stands out for the following:
I thought Ed was a good fellow, what you'd expect from a real estate salesman.Forensic Files - Season 4, Episode 13 - Slippery Motives - Full Episode
The most important thing in the trial was the science, it was the towel ring.Forensic Files - Season 4, Episode 13 - Slippery Motives - Full Episode