The Daily News reported last week that Newsome, 35, had been stripped of his police-issued firearm and placed on desk duty while Internal Affairs investigated an incident that unfolded Oct. 27 inside his girlfriend's house on 57th Street near Master in West Philly.
Newsome, who was off duty, allegedly assaulted the woman after an argument spiraled out of control.
Patrol officers, Internal Affairs investigators and members of Southwest Detectives were among those who responded to the scene of the alleged assault.
The District Attorney's Office charged Newsome, a 16-year veteran of the force, with aggravated assault, simple assault, possessing an instrument of crime, recklessly endangering another person and stalking.
Police Commissioner Charles Ramsey also suspended Newsome, who worked in Olney's 35th District, for 30 days with the intent to dismiss.
Police sources previously told the Daily News that Newsome told detectives that the woman attacked him first, and that she was injured when she slammed into a wall after he pushed her off him in self-defense.
"Lt. Newsome is a decorated, 16-year veteran of the Philadelphia Police Department, and enjoys a healthy relationship with the alleged victim in this matter, as they are the parents of an 11-month-old child," said Anthony Voci Jr., Newsome's attorney.
"The District Attorney's Office was advised that the alleged victim does not wish to pursue this matter, and has signed a notarized statement of renunciation of all prior statements, both verbal and written.
"We look forward to meeting with the District Attorney's Office to discuss an amicable resolution to this matter," Voci said.