PITTSFORD, N.Y. --  A Pittsford man's fight with the Social Security Administration isn't about stolen identity, but a mistaken one. Larry McKnight's much-needed payments have already been suspended.

"I understand there's a lot of Social Security fraud that goes on, but this is not it," said McKnight, who has collected since 2009. On Saturday, he got a letter saying his payments have ended.

"Immediately I said, this can't happen, we have two children in college, we depend on that money to pay bills."

Social Security also says McKnight owes them $6,000. The marketing designer was blown away to find out why. According to the Social Security Administration, it's because he's in prison.

"I wasn't in jail, never have been," McKnight said. "There's nothing we have in common except our first and last name."

Another Larry McKnight, a New York City man who is doing time for arson and robbery, is eligible for parole in June.

"Took me 30 seconds to look up this guy, said he was in prison since October."

McKnight is now trying to get the mess straightened out.

"It's not about entitlement.  It's about the fact that I've worked for 55 years, and I've paid Social Security and I'm using it to live on."

Mistaken identity is bad enough when it happens once.  Unfortunately for McKnight, he's been down this road before. Five years ago, Larry says he went to the local SSA office with ID and paperwork, but couldn't convince anyone there he was not the Larry McKnight who was in prison - the same Larry McKnight he's being confused with now.

"It boggles my mind that they can continue to make the same mistake.  Especially when it impacts people."

The Department of Correctional Services eventually helped McKnight straighten out that mess.  Larry says no one ever apologized. Now, he has to do it again.  

"It has to be happening to other people.  I'm not the only lucky person this is happening to."

The Social Security Administration doesn't comment on specific cases, but a spokesman tells us the agency will work with McKnight to fix the problem. McKnight, with a mortgage and college payments for his kids, says he'll believe it when he sees it.