In 'Should I Marry A Murderer?,' Dr. Caroline Muirhead recalls the jaw-dropping moment when her fiancé, Alexander McKellar, confessed to murder.

One social-media user reacted with, "How dare you?" to the clip, which has now reached nearly 3 million views.

Add Yahoo as a preferred source to see more of our stories on Google. As cliché as it sounds, sometimes you never really know what someone is capable of, even if you’re one of the closest people to ...