Pennsylvania State Police want to make sure the public doesn’t forget the Maine man who was shot and killed in his sport utility vehicle by another motorist on a highway in their state one year ago – a case that remains unsolved.

Police said the assailant in the road rage shooting chased Timothy “Asti” Davison in the northbound lanes along Interstate 81 in Franklin County, Pennsylvania, before ramming Davison’s SUV into a median strip. The person got out of a dark blue Ford Ranger pickup truck and fired several shots into Davison’s vehicle, killing the 28-year-old Poland resident. The killer then fled in a southbound direction.

Despite receiving hundreds of tips, police have been unable to make an arrest. The shooting took place about 2 a.m. on Jan. 4, 2014.

On Friday, Pennsylvania State Police issued a statement to mark the year that has passed and to remind the public that the investigation is still very active.

“Even though it has been one year, we have never stopped investigating this case. We are still committed to solving this homicide and giving the family of Timothy Davison peace of mind,” Lt. Jonathan Mays, commander of the Criminal Investigation Section, said in the press release.

“This has been an extremely difficult case. We continue to seek, collect, and analyze evidence using all means available to us. We also continue to receive and follow up on tips. We encourage the public to share any information they may have,” Mays added.

Davison was driving home to Maine after visiting relatives in Florida for the Christmas holidays when he called 911 to report he was being pursued by the driver of what appeared to be a Ford pickup truck. Police say the pickup truck likely sustained driver’s side or front-end damage.

Since Davison’s slaying, his family has offered a reward and created a Facebook page – Justice for Asti Davison – on which anyone can leave tips or share condolences.

His family recently got permission from Mason Dixon Auto Auction in Chambersburg, Pennsylvania, to hang a banner from a fence located near the spot where Davison was shot.

The banner reads: “Wanted. Any info that leads to the arrest of the person who murdered Timothy ‘Asti’ Davison on Jan. 4, 2014. The killer was believed to be driving a late model dark blue lapis, Ford Ranger. If you have any information please call PA Crime Stoppers 1-800-4PA Tips or contact Asti’s family at JusticeforAsti.com.”

Davison’s mother, Theresa Allocca of Poland, said the family is still grieving his loss and remains hopeful that either the killer will turn himself in or a tip will lead to an arrest.

“What our hope has been all along is the person who did this will come forward or that someone they told will do the right thing,” Allocca said Monday night.

Davison’s family is offering a $12,000 reward for information that leads to the arrest of the killer while Pennsylvania Crime Stoppers, a nonprofit organization dedicated to fighting crime, is offering an additional $10,000 reward.

Pennsylvania State Trooper Robert Hicks, the department’s spokesman, said it is not an exaggeration to say that police have received hundreds of tips since the investigation began. Hicks said it’s important for the public to realize that no matter how insignificant a tip might seem, it could help police solve the case.

“That’s the thing we are really trying to press home to the public. … Someone out there knows something,” Hicks said Monday. “Maybe someone overheard something in a bar. Everything is important. We don’t want the public to get tunnel vision and only think that we want to talk to people who witnessed the shooting. We want people to think outside the box.”