Real story (from Wikipedia):

Thomas Montgomery, a 47-year-old married man was convicted in 2007 of murdering a workmate in a case called the "Internet Chatroom Murder". He posed as "Tommy", a 21-year-old marine, and began an online relationship with a 17-year-old called Jessi. A workmate of his, 22-year-old Brian Barrett, subsequently began an online relationship with the same girl after Montgomery's deception was revealed, and Montgomery shot him in their work car park. "Jessi" was actually a middle-aged woman who had been using pictures of her daughter. A police officer said "he became a completely different person online". Another commented that "It's very odd that someone would take another's life over jealousy of a person you've never laid your eyes on".[54][55] A documentary about this case entitledTalhotblond: (Jessi's screen name) was released in 2009.

Interesting.