There are new developments in a cold murder case from more than 30 years ago. Police say they're finally ready to make an arrest. The problem is they can't find the suspect.

It may just look like an overgrown area on the side of the highway now, but more than 30 years ago this was a rest area and the scene of a murder.

“The family says they would like to see justice done even 33 years later,” Ohio State Highway Patrol Sergeant Linda Piechnik said.

Woodrow Perroud was found shot in the head in 1975 in his car at an Ohio rest area off US-23. Now police say suspects are in Pike County, Kentucky.

Murder suspect 59-year-old Billy Crisp's family tell police he's missing this week just before police sign his arrest warrant on what would have been Perroud's birthday Thursday police say it's not coincidental.

“That he'd been missing for a few days. shortly thereafter, the Ohio Highway Patrol notified us that they have an active warrant for him for murder in the connection with Mr. Perroud's death,” Kentucky State Police Sergeant Steve Spurlock said.

They’ve questioned about 20 people and are figuring things out piece by piece.

“It's a brother-in-law has killed a brother-in-law and right now the motive looks like it's going to be for insurance money,” Sgt. Spurlock said.

Police are considering Crisp armed and dangerous.

Police say Crisp could be anywhere and that's why they need your help to find him.

Their first priority is to arrest Crisp. Then, they say they'll continue questioning another person of interest, Perroud's wife and find the murder weapon they believe is in a Kentucky river. It’s for the Perroud family.

“For 33 years they had no idea what happened to their son and their brother and it's a hard thing for a family to live through,” Sgt. Piechnik said.

And it’s also for justice.

“The highway patrol would really like to see justice done in this case, too. And see the suspects and the murders caught,” Sgt. Piechnik said.

It’s all in an effort to end more than three decades of uncertainty. Police say he drives a charcoal gray 2004 Ford F-250 with an extended cab and a visible spare tire.