Jonathan Crews, a 27-year-old resident of Coppell, Texas, was found dead in his apartment with a fatal gunshot wound to his heart on February 2, 2014. His death was initially ruled as suicide by the medical examiner but his family refused to believe it, as Crews was an expert on firearms safety. They launched their own investigation into his death and believed that his girlfriend, Brenda Lazaro, who was present at the scene that night, was responsible for his murder. Lazaro gave ultimatums to Jonathan and was possessive of him, leading his family to believe that she killed him in a fit of jealousy. She made a frantic 911 call 30 minutes after the shooting and failed to attend his funeral. After years of fighting for justice, Crews' family won the wrongful death lawsuit, receiving a settlement of $206 million. Tonight on Dateline, correspondent Josh Mankiewicz reports on the case with exclusive interviews with key figures and never-before-seen footage. The question remains: who murdered Jonathan Crews?