[citation needed] Later, Mormeck captured the WBA cruiserweight title by a 9th-round technical knockout win over Virgil Hill on 23 February 2002.

Following three defenses with wins over Dale Brown, Alexander Gurov and Virgil Hill again, he added the WBC cruiserweight crown to his collection on 2 April 2005, by way of unanimous decision over Wayne Braithwaite.

Although Mormeck rose up just in time, the referee realized that he was dazed and in no condition to go on, which caused the contest to be stopped and Haye winning the fight by knockout.

On 17 December 2009, Mormeck made his return to the ring after a two-year layoff, fighting for the first time as a heavyweight, against Vinny Maddalone.

[7] In this fight, Mormeck attempted to be only the third cruiserweight champion to win a world title at Heavyweight, after Evander Holyfield and David Haye.

Despite his early stoppage win, Mormeck openly expressed weariness for the fight game following the match, calling for a quick title shot before he could put an end to his career.