Police report that a 21-year-old woman was shot and killed by a man on South Van Ness Avenue early Wednesday morning, the second homicide in the Mission District in the last week.

The woman was named Lisa Williams, according to the Medical Examiner, which said her city of residence could not be determined. Police released little information, pending further investigation, but said the shooting occurred at 2:47 a.m. on South Van Ness Avenue between 19th and 20th streets and involved a man of unknown age, a handgun, and a black car.

Williams was taken to the hospital, police reported, where she was pronounced dead. The police have not made an arrest.

A homeless man who camps near the intersection of 18th Street and South Van Ness Avenue told Mission Local that he initially heard two gun shots. He was awake, he said, because there were “working women hanging out” on the block where he sleeps. He said two women stood near his tent before he heard gunshots and were “trying to make contact with their pimp.” After the gunshots, the man said, “three others came running after the shots.”

“It was very close, because I heard it,” he said about the gunfire. “After the first two, more shots followed.”

Four residents on the block said that they heard gunshots. A resident who declined to give his name said that he heard “a lot of shots” and “a group of girls” screaming. He said that his sister, who was also in the house at the time of the shooting, saw a man fleeing the block shortly after the shots were fired.

Another resident said that she called the police after hearing five gunshots and added that there was a police unit stationed on 20th Street that was able to respond quickly.

The shooting follows that of Jermaine Jackson Jr., an employee with the Department of Public Works, on November 30 at the corner of 25th and Vermont streets. There is no indication the two are related.

Williams’s shooting is the seventh homicide in the Mission District this year.