Philadelphia police say one man is dead after a verbal disagreement turned violent in the Cedarbrook section of the city.
Gunfire erupted at 9:40 p.m. Monday in the basement of a home in the 8300 block of Williams Avenue.
When officers arrived they found a 29-year-old man shot in the back of the head.
Police rushed him to Albert Einstein Medical Center, where he was pronounced dead at 10:54 p.m.
Investigators learned two men had been arguing before the fatal shot was fired.
A search is underway for the gunman.
Argument ends in murder in Cedarbrook, police say