Police are not sure why someone shot and killed a man on the Rail Trail in Zionsville on Sunday morning, but they know the suspect didn't steal the man's wallet.

Officers found Samuel Thomas Bennett's wallet on his body and his mobile phone in his car parked nearby, after he was shot to death on the trail shortly after 6 a.m. Sunday, Zionsville Police Chief Robert Knox said.

"His wallet was found on him," Knox said. "We don't know if any other personal property is missing."

Bennett, 23, lived in Zionsville and parked at Jennings Field, before taking a walk or jogging on the trail, Knox said.

A man who identified himself as Bennett's brother declined to speak on Monday to an IndyStar reporter.

Detectives are interviewing witnesses and reviewing surveillance video from Town Hall and neighborhood schools, but Knox said they have not identified any suspects.

Zionsville is still a safe community, Knox said, but this shooting should remind people to always use caution.

"Somebody came up and shot this man," Knox said. "People need to be vigilant and aware of their surroundings at all times."

Neighbors reported hearing gunshots about 6:07 a.m. Officers found Bennett's body after 7:15 a.m. in a retention area near the Rail Trail and Zionsville Town Hall, adjacent to the Quail Run Apartments.

The shooting happened on a part of the trail close to the Boone Village Shopping Center, which has grocery and hardware stores, a Starbucks and several locally owned restaurants.

Residents jogging and walking on the trail on Monday afternoon told IndyStar that they still felt safe in the area, although some noted that the trail appeared less busy.

“I haven’t seen anybody out here,” said Bernard Huesing, 86, who says he walks the trail every other day with his family. Huesing said he still plans to walk the Rail Trail as he normally would, adding that he believes police would block off the trail if it was dangerous.

Others were more concerned about the homicide — or at least more aware of their surroundings.

“It is a little unnerving,” Kate Messick, 60, said of Sunday's shooting. “I’ll be happy when they figure out exactly what happened.”

Dennis Emery, 70, said he walks the trail almost every day, adding that he was “not too concerned” about safety on the Rail Trail and in the area.

But Emery also didn’t seem too surprised by the news.

“Anytime something like this happens, it makes people more aware and concerned," he said. "It’s a great town, but it’s not immune from violence. No town is.”

Police urge anyone with information to call Boone County Central Dispatch at 765-482-1412.

Call IndyStar reporter Vic Ryckaert at 317-444-2701. Follow him on Twitter: @VicRyc.