Inside the mind of murderer Mark Twitchell. Letters from the man police say wanted to be like fictional serial killer Dexter. Troy Roberts reports.
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The Snapchat Reveal

“48 Hours” uncovers the narrative behind crime and justice cases that have left a lasting mark on society. Award-winning CBS News correspondents thoughtfully examine the complexities of each crime by transporting you to the heart of the investigation through key evidence and gripping interviews with critical figures from the case. The unmatched reporting has made a tangible difference in countless lives, leading to the exoneration of wrongly convicted individuals and the reopening — and resolution — of previously closed cold cases.
Listen to a new “48 Hours” episode every Monday and then go deeper into the case on Tuesdays with the immersive “Post Mortem” series — producers and correspondents join host Anne-Marie Green to discuss key evidence, dead ends, mishaps, and stranger-than-fiction twists they faced in the field. Also available on the 48 Hours YouTube channel. Plus, every Thursday, we’ll revisit a classic “48 Hours” episode. 
Get ad free access to "48 Hours" podcasts by subscribing to 48 Hours+ on Apple Podcasts: https://apple.co/4aEgENo.