The Brief Zakah Johnson, 15, is accused of fatally shooting a DoorDash delivery driver in Southwest Philadelphia on July 7. Johnson was arrested on unrelated charges on Thursday, and investigators soon discovered his alleged link to the homicide. A 15-year-old boy was arrested in connection with the deadly shooting of a DoorDash driver earlier this month in Southwest Philadelphia, investigators announced on Friday. What we know:Zakah Johnson, 15, was arrested Thursday on charges unrelated to the July 7 shooting death of 43-year-old Mahfuzul Haque. Police found Haque laying near a DoorDash delivery bag suffering from a gunshot wound to the back of the head.