OAKLAND -- A man shot to death outside his East Oakland home Tuesday night was identified as Qingjun Sun, a 56-year-old acupuncturist, authorities said Wednesday.

Sun was shot to death about 8:40 p.m. in the 800 block of Hawkins Drive, a newer housing development in the middle of an industrial area not far from the Oakland Coliseum.

Police believe he had just arrived home from work when he was shot. Sgt. Steven Bang said police don't have a motive yet, and no arrests have been made.

On Wednesday afternoon, a single red flower in a pot had been placed in front of Sun's home, which neighbors said he shared with his wife. No one answered a knock at the door, and no relatives could be reached.

Residents in the development, which opened four years ago, were still getting over the shock of the killing.

One neighbor, who did not want his name used, said he would see Sun and his wife regularly walking their mastiff dog named Tiger in the neighborhood. "They were very friendly. They would always wave and speak. This is sad, sad."

Neighbors knew Sun was an acupuncturist and thought he had a grown son who did not live with them.

The development, known as Arcadia Park, has been generally crime-free but another neighbor, who also did not want his name used, said there has been some violence in the past month, including an armed robbery of one resident and an attempted home invasion robbery.

"You can't forget where you're at," the neighbor said. "It is unnerving."

The killing was Oakland's 121st homicide of the year, 11 more than all of 2011.

Meanwhile, a 62-year-old woman was shot about 8:51 p.m. while sitting in a car in the 900 block of 18th Street in West Oakland. She was in stable condition at a hospital. A gunman opened fire on the vehicle from outside. There were other occupants in the car, but they were not hurt. Police did not release a motive in the shooting, and no arrests have been made.

A man was shot about 2:34 p.m. in the 400 block of 60th Street near Telegraph Avenue in North Oakland. He was in stable condition at a hospital but was not cooperating with police.

Police don't have a motive yet but are investigating if the shooting is related to another one that happened about 8:30 p.m. Monday in the 500 block of 59th Street where a man was wounded.

No arrests have been made in either case, and police have not ruled out the possibility the two shootings are gang-related.

Police and Crime Stoppers of Oakland are offering up to $10,000 in reward money for information leading to the arrest of Sun's killer. Anyone with information can call police at 510-238-3821 or a tip line at 510-773-2805 or Crime Stoppers at 510-777-8572. Tips can also be sent anonymously via text message. Text to 888-777 and include the words TipOaklandPD.

Police are also investigating two nonfatal shootings that happened Tuesday.