'Baby Reindeer' viewers watched a stalking drama — then hunted down 'the real Martha Scott.' A psychologist explains why true crime turns us into armchair detectives.

Netflix; Jenny Chang-Rodriguez/BI

• "Baby Reindeer" gripped audiences with the true story of a woman stalking an aspiring comedian. 
• Some viewers tried to identify the real-life stalker by hunting for her on social media.
• A psychologist told Business Insider why true crime turns viewers into armchair detectives.

Netflix's "Baby Reindeer" gripped audiences with the story of Donny Dunn, an aspiring comedian who is stalked by a woman after...