PHOENIX -- He served in the Vietnam War and was regarded as a model employee at a Valley printing shop, but over Memorial Day weekend in 1995 Jimmy Robertson vanished.
"I still go places thinking I might see him," said Robertson's good friend and former colleague Rudy Solano.
Even though it's been nearly 20 years since Robertson disappeared, Solano can't help but wonder what happened?
"You just don't give up, you try to keep looking," Solano said.
Solano worked with Robertson at Stevens Printing Shop on West McDowell Road. When 3TV interviewed Robertson's boss after he disappeared, she said she was the one who filed a missing person's report.
"It's unlike him to not call me and say, 'I'm going to be a little late,' or something like that," Linda Stevens said.
Detective Stuart Somershoe said what's unique about this missing person's case is there was a scene and even a witness.
"In this case we have a lot of evidence," he said.
Robertson lived at Spinnaker Landing Apartments. One of his neighbors was last to see him alive, telling people they saw Robertson leave on May 27. Later that night, someone else saw Robertson's Ford truck parked in what used to be a Food City grocery store on 16th Street.
"A physical struggle was observed inside the truck," Somershoe said.
But when police arrived, there was no sign of Robertson's truck. Officers only found his blood-soaked wallet.
"The motive in this case appears to be robbery," Somershoe said. "Somebody was trying to take Jim's truck away from him and take money from him, probably."
The next day, a horrifying discovery led to a break in the case. Robertson's Ford truck was parked near Nogales.
"Blood was literally dripping out of the truck," Somershoe said. "It was clear it was a crime scene there. It was impounded and then processed."
While Somershoe is confident Robertson was killed inside his truck and then dumped somewhere between Phoenix and Nogales, he knows there are two sides to every case.
"If they come forward, they can give me their side of the story and that could change what they get charged with," he said.
"Jimmy was a great person," Solano said. "It's not right what happened to him."
If you have any information about this murder, contact Silent Witness at 480-WITNESS or toll free at 1-800-343-TIPS. You can also leave an anonymous tip on the Silent Witness website.