UPDATED: August 22, 1:29 p.m.
Authorities said 19-year-old Herbert Morrison turned himself in on Saturday, claiming to be one of the teens who attacked delivery driver Zachary Lean in South Philadelphia on Tuesday. Morrison has been charged with aggravated assault, reckless endangerment and conspiracy.
Investigators are still working to identify the others.
The original story follows.
PHILADELPHIA (KYW Newsradio) — Police are looking for a group of teens who attacked a delivery driver in South Philadelphia earlier this week, placing him in a coma.
It was around 9 or 10 p.m. Tuesday evening when Zachary Lean was finishing a grocery delivery shift near 3rd and Christian streets.
"It was clear he was punched in the head, either on the side or the back. He fell backwards," said his wife, Christine Torrisi. She spoke with Lean just an hour before the attack.
Investigators say the video shows Lean hit his head on the ground and began seizing. He was found unconscious around 10:15 p.m. and was taken to Jefferson Hospital, where he is now intubated, in a coma and fighting for his life.

"There is a fracture in the back of his skull which caused his brain to swell and bleed," said Torrisi.
"My sweet, kind, loving, gentle husband being beaten to a near inch of his life...for what? For what?"
The pair had just married in May.
Torrisi, who is a social worker, says she has compassion and understands how teens act in groups, but she wants them to know the hurt they caused.
"I want these kids to understand there is so much more for them that's good. I don't know what happened. I don't know why this happened. He is the kindest person. He was just working to support his family. We just got married. We just wanted to start a family, live our lives," Torrisi said.
"I just wish they would tell their parents or anybody, and just come forward about why this happened, and what we can do to help them not do this again."
Philadelphia police urges anyone with information to call their tip line, even if anonymously, at 215-686-TIPS.