Update: Watched "Making a Murderer" and pining for an update to our Reasonable Doubt segment? Producer Pat Walters sat down with the producers of "Making and Murderer" to talk about their show and we have an update for you! (Which you'll hear at the very end of this segment.) 

On July 29th, 1985, a 36-year-old woman named Penny Beerntsen went for a jog on the beach near her home. About a mile into her run, she passed a man in a leather jacket, said hello and kept running. On her way back, he re-appeared. What happened next would cause Penny to question everything she thought she knew about judging people — and, in the end, her ability to be certain of anything.

NOTE: This segment contains graphic descriptions of sexual assault and violence.