Debra Morgan is Dexter's step-sister.

They became related when Dexter was adopted by Deb's father, Harry, who instantly developed a bond with his new son. Deb grew of very jealous of it.

Debra is a detective in the Miami Police Department. At one point, she got engaged to a man that ended up being the notorious murderer known as The Ice Truck Killer. That's never fun.

This detective as a seriously dirty mouth and a very aggressive, up-front attitude. She's far from shy.

Debra Morgan Quotes

I don't wanna step on my dick.

Deb

Debra Morgan: Why is it we never talk brother-sister stuff?
Dexter Morgan: Our dad was a cop, you're a cop, I work for the cops... for us, this is brother-sister stuff.

Dexter Quotes

I don't wanna step on my dick.

Deb

Sometimes partners find us, and as much as we try to push them away, they work their way into our lives, regardless - until we finally realize how much we need them.

Dexter