Inside Edition reports that the real-life case that inspired the film “Three Billboards Outside Ebbings, Missouri” is now offering an increased reward of $6,000 for information in the 1991 strangling of Kathy Page.

She was found dead in her car, in what authorities determined to be a staged scene to make her death look like an accident.  Her father, James Fulton, has been putting up signs along I-10 in the years since her death with sayings such as “Vidor P.D. does not want to solve this case…The Attorney General should investigate.”

Family members believe that Page was murdered by her estranged husband, but no charges have been filed against him.

The Texas Department of Public Safety issued the announcement of the increased reward last week, which has given Fulton, now 87, renewed hope in the case.

British writer and director Martin McDonagh noticed the billboards twenty years ago as he was riding a Greyhound bus in Texas. He went on to write the Oscar-winning movie that starred Sam Rockwell and Francis McDormand.

Fulton has not seen the film and was not aware it was nominated for seven Academy Awards, but he is happy it has brought more attention to the case in the public eye.

*Photo credit CBS Interactive Inc.