The autopsy found 27-year-old Robert Braxton III of Montgomeryville's manner of death was homicide.
During a Sunday afternoon press conference, Montgomery County District Attorney Kevin Steele said the person who killed Braxton is being interviewed and is cooperating with the investigation.
No charges have been filed as of yet in the April 24th shooting.
PHOTOS: Deadly shooting at North Wales church
The incident happened at 11 a.m. Sunday at Keystone Fellowship Church on the 400 block of Stump Road.
Church member Breeana Somers says gunfire erupted as the congregation stopped singing.
"We were worshiping and you hear three different gunshots," said Somers. "Everybody went on the floor and was hiding."
Steele said a disturbance that escalated to an altercation occurred between the victim and the gunman.
"There was a disturbance. It escalated into an altercation between two church members," said Steele.
Steele says that led one church member to shoot Braxton. He wouldn't identify the gunman, but says he is licensed to carry a concealed weapon.
"The investigating is ongoing. We're going to have to determine whether the shooting was justified under the law," said Steele.
Steele wouldn't elaborate on how the shooting could be justified. He says he doesn't believe Braxton was armed.
UPDATE: DA Steele says 27yo Robert Braxton was shot in chest by another member of Keystone Fellowship Church, NorthWales.Shooter not charged— Jeff Chirico (@JeffChirico) April 24, 2016
Braxton was taken to Abington-Lansdale Hospital where he was pronounced dead at 12:11 p.m.
DA Steele: Shooter was also injured, treated and released from hospital. Shooting victim was not armed. #churchshooting— Jeff Chirico (@JeffChirico) April 24, 2016
The gunman was also injured, Steele said. He was treated and released from the hospital.