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UPDATED at 10:45 a.m. Wednesday with description of gunman and possible motive.

ST. LOUIS — The shooting that left a man critically injured north of Forest Park on Tuesday night appears to be drug-related, police said Wednesday.

The man, 41, was in critical and unstable condition at a hospital. Police said he was shot in the head about 8:50 p.m. in the 5600 block of Pershing Avenue. The scene is about 1½ blocks north of Forest Park.

No one has been arrested.

Police said the gunman is described as a black man, 25 to 30 years old, 5-foot-11 to 6-foot-1 and weighing 250 to 300 pounds. He had medium-length hair and a beard. He was wearing a white shirt and gray pants.

Detectives were unable to talk with the victim. But police said that, based on their early investigation, police believe he was shot during a drug transaction.

-Kim Bell of the Post-Dispatch staff contributed to this report.