User blog comment:Tommy,Klaus&Kol2012+/One character that probably wont return(spoilers ahead)/@comment-74.132.82.188-20190707210246

Marl had a career before Supernatural and continues to have a career after. There are many rumors and much contention over why Mark left, but his leaving appears to have been a bitter one. His lack of return may not be his choice nor be due to disrespect for the show or his fans. There are many videoes online of Mark addressing this issue at various non-Supernatural conventions, and he tries to be both discreet and respectful while being honest.