The new season isn't until July 18 and they've already done the episodes for that so you'll see Dr. Kroger the rest of this year, for sure. Look at the videos with Kamel about the new season and his favorites.

http://video.usanetwork.com/player/?id=153535

I'm sure they'll just phase him out, have Monk go to a new therapist for a reason off screen. Kamel had a heart attack and was 65.