MARION COUNTY, TN. (WRCB) -- A Marion County man is missing and investigators say he simply disappeared.

Roger Tant was last seen at his home on South Pittsburg Mountain. But it wasn't until his sister tried to reach him that police learned he'd been missing since March.

Monday night, investigators say they've hit a dead end and hope someone can lead them in the right direction.

No one has seen or heard from 54-year-old Roger Tant in four months.

"No records have showed up of him using a credit card or anything," Sheriff Bo Burnett tells Channel 3. "No one has talked to him or seen him the last few months. It's just like he's vanished."

He was last seen at his Hewgley Road home. But his wife, who lives with him, didn't report him missing.

Tant's sister called police last week when she couldn't reach him.

"His birthday came up and Connie tried to get in touch with him," neighbor, James Blevins says. "That was the first I was aware of it."

James Blevins says Tant is unemployed and keeps to himself, but he says it isn't like his neighbor to leave home.

"Everyone on this mountain knows him, is familiar with him," Blevins says. "It's just not like Roger to leave the mountain for that long."

He wonders where Tant could be.

"It kind of makes you wonder, how did he leave," he says. "Or who came and got him? It is kind of strange that his vehicle is still there."

Tant's name has been added to the FBI's missing persons database.

Sheriff Burnett hopes it will lead to a break in the case.

"Maybe if the public, someone has seen him since March the 10th, we'd just like them to contact us," the Sheriff says.

Channel 3 attempted to reach Tant's wife.

Marion County investigators ask that if anyone has seen Tant since March, or knows where he is, to contact them at (423) 942-5667, or the TBI's Chattanooga office at (423) 634-3044.