A postal worker was shot in the leg Tuesday night on the Far South Side reportedly after a neighbor became angry that he was delivering the mail too late.

A Calumet District police captain said a witness heard a person yelling that the 31-year-old postal worker was delivering the mail too late and then heard a shot.

"I think they wanted him to deliver the mail faster," the captain said.

Police News Affairs Officer Tom Polick said the man was shot in the leg about 6:30 p.m. in the area of West 118th Street and South State Street. He was taken to Advocate Christ Medical Center in Oak Lawn in "stable" condition.

The captain said the postal worker was walking his route with his mail cart when he was shot.

"Nobody knows where the shot came from," the captain said. "It was really dark."

The postal worker was identified as 31-year-old Denny Robinson, a 10-year veteran of the postal service.

Robinson's relatives told NBC5's Anna Davlantes that Robinson had wanted to work another route due to the constant gunfire in the neighborhood.

"Week after week, after week, they've been just constantly shooting every week over in that area," said Linda Robinson, the postal worker's aunt. "He's been complaining about that they've been constantly shooting."

Family members added that they did not know if Robinson was targeted specifically for late mail complaints, but postal service officials said that is what happened.

Authorities were still searching for the gunman late Tuesday night.

Additional information provided by Chicago Sun-Times Inc.