San Francisco police are investigating a dead body found in Lake Merced late Sunday afternoon.

The body was found by a person kayaking in the lake around 4 p.m., according to Sgt. Lyn Tomioka of SFPD. The medical examiner has not been able to ID the body, but described it as a white male, 5-foot-7 and 167 pounds with dark brown hair and a scar on his left shoulder.

The unidentified man was wearing green boxer shorts and a dark colored shirt.

There were no obvious signs of trauma, according to Tomioka. Police are treating the case as a suspicious death.

Two dragon boating instructors assisted police and firefighters to help retrieve the body out of the lake using a dragon boat.

An autopsy was scheduled for March 15, but could take days to about a week to find the cause of death.

If anyone has information, call the medical examiner's office (415) 553-1694.