How 'The Walking Dead' changed Jeffrey Dean Morgan

Jeffrey Dean Morgan has had many roles in Hollywood, but the longtime actor said told BUILD Series that he completely underestimated the success of his current role on the hit AMC series, "The Walking Dead."

"I've had a couple of decent successes in my life. How could it possibly change my life? I think I was horribly wrong. I miscalculated this show and maybe this character, how popular he is."

Morgan, of course, plays the role of Negan, an emotionally abusive and malicious character that has been terrorizing people.

Check out what Morgan had to say about his role as Negan:

1. The fans are definitely enthusiastic

"The fans are so passionate. I need to look in my rear view mirror when I come home from work. People follow me home. I get weird mail," he gabbed. The weirdest mail so far has been some interesting offers. "I get lots of weird propositions. Sexual propositions with like ball gags involved..and maybe Lucille. It's weird. There's some weird stuff out there."

2. The spoiler prevention tactics are unprecedented

Fans are determined to spoil "The Walking Dead." "It seems crazy to me. Just watch something else for a couple months and we'll be back and you'll find out. We had to hide cast members so you couldn't deduce who was there and who wasn't there. The only person who could give interviews was me because the only person we know is alive is Negan. He didn't hit himself, most likely, with the baseball bat."

PHOTOS: Check out 'The Walking Dead'

3. Have you ever memorized 17 pages overnight?

Because of the crazy obsession with spoiling the show's major plot twists, Morgan is given his script 1-2 days before shooting. He confessed he could always use more time with the dialogue. Memorizing Negan's lengthy monologues in such short time is no easy feat.

4. Morgan is using his notoriety for the role to spread a good message

The "Wounded Warrior Project" is a military and veterans charity service organization empowering injured veterans and their families. Morgan wore a "Wounded Warrior" baseball cap on "BUILD," where he explained his connection to the armed services. "This is one of my favorite hats to wear at the convention circuit. I can't tell you how many men and women I've met that have served our country and been so happy and proud that I've worn this hat. It caused such a reaction it is now one of my most loved hats. It brings up conversations that are great and sometimes hard and sometimes emotional but they're all good."

5. He read the comics

"I was always fascinated with the Negan-Carl storyline. That was always something I looked at as a reader, fan of the graphic novel, that I really would like to approach in the show."