MH's real name is Mark Copani, and below is an extract from Wikipediae.org relating to his departure.
At the Great American Bash 2005, after Hassan's loss in a match with The Undertaker, Hassan was given the Last Ride through an open stage ramp onto a concrete floor where it was reported that he sustained serious injuries and had to be rushed to a nearby medical facility, apparently a solution aimed to end the Hassan character. Several days later, when WWE.com hosted a video of a Storyline announcement from Theodore Long, where he reiterates the stipulation that Hassan would no longer appear on SmackDown!. Due to increasing public pressure, the WWE was forced to later drop the character altogether, sending Hassan and Daivari to their developmental territories to alter their gimmicks.This resulted in huge fan backlash, mostly because Hassan had developed a cult following of sorts, and had been booked to possibly win the World Title.
Although Daivari would report to Deep South Wrestling (and later would return to WWE), wrestling reports indicated that Hassan would not, and on September 21, 2005, Hassan parted ways with WWE. While the WWE article detailing his release indicated that he may return in the future (possibly in his Hassan character), Copani was quoted as being eager to pursue a career in acting. However, he has left open the possibility of returning to wrestling in WWE.