Troy Preston, 47, was fatally shot on January 9, 2015, in Baltimore, Maryland, after a dispute over a parking space. A U.S. Air Force veteran and father, Preston was shot in the head in front of a home on Glenkirk Road during an altercation that involved a long-standing argument between the shooter and another man, Robert Durham Thomas.

According to accounts, the neighbor Dennis Padgett confronted Preston and Thomas, returned to his house armed with an AR-15 and a 9mm handgun, and shot Preston at close range. Padgett then pursued Thomas and shot him a block away on Northern Parkway; both men died. Padgett surrendered to police and admitted to the killings during an interview, and was arrested and charged with first-degree murder and weapons violations.

What details about the dispute or the neighborhood might help explain how a parking argument escalated to such lethal violence?