Between 1966 and 1972, Beyer wrestled as Doctor X while in the American Wrestling Association (AWA). During his time as Doctor X, Beyer had matches with many of the top names in the business, including Billy Red Lyons. In fact, it was Lyons who handed "X" his first AWA defeat when he defeated him with a figure four leg lock. In August 1970, "X" removed his own mask to get a chance at revenge against his former partner Black Jack Lanza. He stood in the center of the ring with announcer Marty O'Neill, who told the fans that "X" was a former local coach. "X" then removed his mask and wrestled the match as Dick Beyer.
During 1972, Beyer had several battles with "Crippler" Ray Stevens. Their last match resulted in Beyer, as Doctor X, having his leg "broken." This "injury" allowed Beyer to leave the AWA.
He inducted Gorgeous George into the WWE Hall of Fame on March 27, 2010.
On March 7, 2019, Beyer passed away.