Eric Ervin, 41, of Coopersburg, Pennsylvania, was found killed inside a work trailer at his auto detailing business in Allentown on April 8, 2014. Ervin owned Ace’s High Mobile Auto Detailing and was reported missing by his girlfriend after he failed to return home from work; her report led to the discovery of his body.

Investigators connected the killing to a Craigslist car sale. Ervin had listed a 2003 BMW 745i, and 29-year-old Tyrell Young of Reading, Pennsylvania, responded and went to Allentown to view the vehicle. An argument about the car’s condition ended when Young shot Ervin once in the neck. Young later admitted planning to sell the BMW for parts.

What additional details about the meeting or the handling of the Craigslist transaction might help explain how this encounter turned deadly?