Allegheny County District Attorney Stephen Zappala Jr. spoke with the media Wednesday morning.
According to Zappala, there is no evidence that Rose physically did anything illegal that night leading up to the encounter, and therefore, there is no justification for the use of force.
Rosfeld is now out on bail, and will be back in court for a preliminary hearing on July 6.
The East Pittsburgh Police officer who fatally shot 17-year-old Antwon Rose Jr. on June 19 has been charged.
CBS affiliate KDKA reports that court records show the charge of criminal homicide has been filed against East Pittsburgh Police Officer Michael Rosfeld.
According to KDKA sources, Rosfeld had only been on duty in East Pittsburgh for three weeks, and was formally sworn in only 90 minutes before the shooting.
Rosfeld had been working as a police officer in the region since 2011, previously working in Harmarville and Oakmont.
He also worked for the University of Pittsburgh Police Department, and was reportedly dismissed for cause from the university. Pitt turned his personnel file over to county investigators as part of the investigation.
The event has lead to daily protests around Pittsburgh.