The Boston Police Department reports homicide detectives and an FBI crime lab have identified a man whose stabbed body was found in Boston Harbor near Thompson Island on Dec. 4, 1991 as Toussaint Gonsalves, a graduate of the old Boston High School and possibly a resident of Dorchester.

Police say Gonsalves was born on Oct. 2, 1970 and at the time of his death was about 5'11" and approximately 225 lbs. with short brown hair and brown eyes.

They add: "He was wearing a heavy grey multi-colored knit sweater and a blue, white and green rugby shirt, black pants over red running shorts, and two pairs of black socks and black high-top sneakers. He had three scars on his left hand and his eyebrow appeared to have been shaved."

According to police:

"Mr. Gonsalves’ identification is a direct result of the FBI’s use of investigative genetic genealogy, a unique method used to generate new leads in unsolved homicides, sex assaults, and other violent crimes. It combines the use of DNA analysis with traditional genealogical research and historical records to generate investigative leads. Investigators only obtain what any other customer using a publicly accessible genealogical service would receive from using it.

"Since his identification, investigators have learned Mr. Gonsalves attended the former Boston High School and may have been living in Newton or Dorchester at the time of his murder. He also may have been employed working in a kitchen."

Although he was not initially identified, police say an autopsy at the time showed he was the victim of a homicide.

Anybody with information can call detectives at 617-343-4470 or contact the anonymous tip line by calling 800-494-TIPS or by texting TIP to CRIME (27463).