For law enforcement, the difference between having a cold case and a closed case is having some new tips.
And to solve the murders of Robert and Colleen Grube, the Mercer County Sheriff is seeking that extra information.
"Some of the things people have called us on... have given us some good information when we've followed up on it," said Sheriff Jeff Grey, Mercer County.
Now the Ohio Attorney General's office is putting together a centralized database to focus new attention on Ohio's unsolved homicides.
"No one has ever kept track of them, and we're going to start doing that for the first time," said Mike DeWine, Attorney General, Ohio.
So far, there are 166 murders on the database, including the Grubes. However there's an estimated 5,000 unsolved murders in the state.
The Attorney General's office is sending letters to every law enforcement agency in the state to find other unsolved murders to add to the database. The goal is to list every case.
Special Agent Roger Davis came up with the idea in the fall of 2010 after getting calls from departments in Colorado and Florida with inmates wanting to confess to murders in Ohio.
"The only information I had was seafood truck driver and box truck in a lake," said Davis.
The cases remain unsolved, but if more murders are added to the database, agents might be able to find cases that match the descriptions. People can also leave tips on the website. Including tips on the Fort Recovery father and daughter.
To check out the database go to ohioattorneygeneral.gov.
As for the Grube murders. Sheriff Grey says the department is following up on two new leads. The tips were made after a $10,000 reward was offered for information leading to a conviction. The reward has now grown to $20,000.