A 21-year-old man was killed after a gunman opened fire at a group of people in a Lennox parking lot on Dec. 28, 2014. (Credit: OnScene TV)

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Homicide detectives were investigating Monday after a 21-year-old man was fatally shot outside a restaurant in the Lennox area of South Bay.

The shooting occurred in the 11100 block of Inglewood Avenue (map) at about 11 p.m. Sunday, according to a news release from the Los Angeles County Sheriff's Department.

A witness told sheriff's deputies that a shooter opened fire on a group of people who were hanging out in the back parking lot of a restaurant.

The 21-year-old man was the only person hit by the gunfire, according to the Sheriff's Department.

He later died of his injuries after being rushed to a local hospital.

The victim's name has not been released.

Investigators did not have a detailed description of the shooter, who remained at-large as of Monday morning.

No further details were available.

Anyone with information about the shooting was encouraged to call the L.A. County Sheriff's Department's Homicide Bureau at 323-890-5500.

Those wishing to provide a tip anonymously were asked to contact Crime Stoppers by calling 800-222-8477, texting the letters "TIPLA" plus a tip to 274637, or through the website http://lacrimestoppers.org.