Haynes was shot while standing on a street corner talking to a couple of young ladies back on September 8th.
Police say he stumbled down the block and collapsed at 29th and Nicholas
At the time, police said the shooting may have been a case of mistaken identity, but when they announced the arrest on Friday investigators said there was a history of bullying between the two young men.
However, the circumstances of that history between the two teens is not clear at this time.
Friends say Haynes was preparing to enroll at Roxborough High School.