The former child star, who played the son of the monster family in the 1960s TV show, originally began corresponding with Donna McCall when The Munsters became a big hit in the U.S. and she would send fan mail to him.
The pair lost touch for decades but McCall reconnected with Patrick a few years ago and they agreed to meet for the first time at DraculaCon II in Pennsylvania earlier this year (10).
They embarked on a whirlwind romance and McCall, a former cheerleader for American football team the Philadelphia Eagles, recently accepted Patrick's marriage proposal.
McCall, 55, tells the National Enquirer, "My first crush was Butch Patrick. I met him for the first time, but I feel like I've known him forever.
"It's a great love story. We're very happy together."
Patrick, 57, has since set up home with McCall in West Chester, Pennsylvania after packing up his homes in Florida and Los Angeles.