Misha Collins writes a lengthy, heartfelt letter to Supernatural fans

TV Guide

"In 2008, my life changed forever," Collins wrote in a letter posted to Twitter, one week after the final season announcement. "What was supposed to be a small part lasting a couple of episodes on a genre TV show turned into over a decade of my career. I had no idea that when I stepped onto that set for what I thought was a simple acting gig, I was actually being welcomed into a family--not just a cast-and-crew family (though certainly that--I've found some of my closest friends in Jared, Jensen, & so many others in our cast and crew), but in all of you... our SPNFamily."