Authorities have identified the man who apparently drowned in the Charles River in Cambridge.
Middlesex County District Attorney Marian Ryan said in a statement Saturday that the victim was 18-year-old Tyler Greene, of Georgia.
Investigators believe the drowning was accidental.
Witnesses say Greene went into the water off the Weeks footbridge in Cambridge and came up with his arms flailing before he went under again. It happened around 8:45 p.m. Friday.
Authorities say Cambridge Police Department divers found him about 25 minutes later. He was taken to a hospital where he was pronounced dead.
State police are still investigating the circumstances of the drowning.