POLAND — It’s been just over a year since Timothy “Asti” Davison was run off an interstate highway in Pennsylvania and gunned down. The search for the killer continues, and now Davison’s family is upping the reward for his or her capture.

The family reward has been increased from about $22,000 to $50,000, Pennsylvania police said. Add that to the $10,000 being offered by Crime Stoppers and a $60,000 bounty is out there for information leading to a conviction.

Davison, 28, was gunned down in the early-morning hours on Jan. 4 along Interstate 81 in Franklin County, Pa. State and local police in that state have formed a multiunit task force with representatives from the FBI and Maryland State Police to hunt down the unidentified assailant.

Davison described the attack to 911 operators before dying from his wounds, state police said. He told dispatchers that a Ford Ranger-style vehicle was following him and that one of the occupants was firing a weapon at him. The suspect then reportedly rammed Davison’s vehicle off the road and fired several rounds into it. The incident occurred just north of the Maryland-Pennsylvania state line.

In the days and weeks following the slaying, friends, family members and strangers waited for word that the crime had been solved. Weeks turned to months, which now has turned to a year. The killer remains at large.

The investigation has been moving forward on several fronts. While police field tips and examine evidence, Davison’s friends and family have kept the story alive on the Web, at justiceforasti.com, where leads and tips are invited.

The space is also used to memorialize Davison.

“His friends describe him as ridiculously funny, kind, generous, spontaneous,” according to the website biography page, “always there when you needed him, and loyal — basically, the kind of friend that we all want in our lives.

“His parents,” the biography continues, “would add family oriented; a loving son, hard-working, and moody until you fed him! He was reliable and could always be counted on to do the right thing. He loved the elderly, children and animals. He wasn’t afraid to say ‘I love you,’ give hugs out freely and had an infectious laugh that would spread throughout a room. For a young man of 28, he had touched many lives and hearts.”

Pennsylvania state police are asking anyone who may have information about Davison’s slaying to contact the Pennsylvania Crime Stoppers Tip Line at 1-800-4PA-TIPS. The Crime Stoppers website can be found at crimewatchpa.com. Tips can also be left at the Pennsylvania State Police Barracks in Chambersburg at 717-264-5161.