CLEVELAND -- Cory Barron was dropped off at Friday's Jason Aldean concert at Progressive Field by his parents, along with two friends and two siblings. The plan was for them all to head back to Fremont, Ohio together after the show. That never happened.

His grandfather tells our partners at WTAM 1100 that Cory ran into a friend from Bowling Green -- and after the two talked over a beer he was supposed to go back to his seat. That never happened either.

RELATED: Search continues for missing Cleveland concertgoer

"He didn't have any financial problems. He graduated college, worked in Sandsuky -- he was happy as a lark," Gene Slotto, Cory's grandfather told WTAM's Mike Trivisonno. "Cory, get home. We all love you, get home," he said emotionally on the radio Monday afternoon.

Cleveland Police and the FBI spent the better part of Monday combing through the waterways, green spaces, industrial parks and train tracks south and west of Progressive Field. Since Cory's phone went dead they can't pinpoint his location. Investigators feel the areas south and west of the ballpark were a more likely route because if he went north -- toward the city -- he'd likely be spotted by business owners or concert goers.

Investigators are still asking for anyone with information to contact them with details. In the meantime they're combing through dozens of cameras in the are hoping to spot Cory.

His grandfather says Cory does not have a history of drug problems, no mental issues or a history of running away.

"Just something in my gut tells me something is not right for this to happen," Kent Weaver tells Channel 3. "He wasn't the type of kid to just run away. As a friend, I am very worried."

Police have used a heat-sensing helicopter to search from the air. They've checked hospitals, jails, waterways, just about anywhere Cory Barron could be. Now the progress moves to more detective duties, less physical searching.

Cleveland Police say Barron's cell phone is being monitored for activity, which has not happened since Friday.

His friends are on twitter, and the hashtag #HelpFindCory, which police say has already generated new leads.

Barron is 6 foot 2, weighs 225 pounds, with brown hair and blue eyes. He had jeans and a Budweiser teeshirt on Friday.

If you have any information you're asked to call Cleveland Police at 216-623-5300.

Follow WKYC's Chris Tye on Twitter: @TVTye