Det. Munch was my favorite charecter on SVU, and way underused. Apparently the charecter is leaving to take a job as "special investigator for the attorney generals office" leaving future guest appearances open.
One minor thing that annoys me with all the L&O shows is that they seem oblivious to the fact that police officers typically retire long before the ages the characters reach on the show.
Granted, there are a lot of unrealistic things on L&O shows. However, just once I'd like to see one of the departing old-timers just, you know, actually retire instead of either killing them off or giving them another job.