Walter Roark, 45, of Manchester has been charged with murder in the death of his wife, who had been missing since the middle of June.
Clay County Sheriff Kevin Johnson said that during an interview Wednesday, Roark admitted to killing Stephanie Roark, 39, and burying her under their home.
"At that time, we pretty much got a confession out of him," Johnson said.
During previous interviews, Roark maintained that Stephanie Roark had left in a white car early one morning and disappeared, Johnson said.
She was reported missing in early July by an uncle who said he hadn't seen her in a couple of weeks, Johnson said.
Throughout the searches for her and interviews with Roark and family and friends, "it always went back to, well, he was the last person she was with," Johnson said.
On Wednesday, Johnson said Roark told them where to find her: in a shallow grave under their trailer at 2688 Sandhill Road in Manchester.
Stephanie Roark's body was sent to Frankfort on Thursday for an autopsy. Johnson expects to get preliminary results sometime Friday.
Walter Roark is being held with no bond in the Clay County Detention Center on one count of murder-domestic violence and one count of abuse of a corpse. His arraignment is scheduled for Monday.