Deah Shaddy Barakat, 23, was shot dead on February 10, 2015, in his Chapel Hill condominium along with his wife, Yusor Mohammad Abu-Salha, 21, and her sister, Razan Mohammad Abu-Salha, 19. The three were found by police after a report of gunshots at the Finley Forest Condominiums on Summerwalk Circle at about 5:15 p.m. Barakat was discovered in the front doorway bleeding from the head; the two women were in the kitchen and its doorway. All three had suffered fatal gunshot wounds to the head and were pronounced dead at the scene.

A neighbor, Craig Stephen Hicks, 46, turned himself in to Chapel Hill police later that day and was arrested. Police said the initial investigation pointed to a long-running neighbor dispute over parking as the apparent motive. The FBI and the Department of Justice opened parallel inquiries, but federal authorities said they did not find sufficient evidence to file hate crime charges.

What details about the dispute or the events that evening might help explain how this confrontation escalated to murder?