What lies behind a troubled mind? Psychologists examine the killer and his insanity claim.

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Find out more about the book Death on the River by Diane Fanning here: bit.ly/deathriver

Can't wait to hear the rest of the season? Listen to all the episodes ahead of time on Stitcher Premium. Go to StitcherPremium.com/caseclosed and use the code CLOSED for a free trial.

For more on this case, check out Crazy for You by Michael Fleeman here: bit.ly/crazyforyoubook