I want to get revenge on a co-worker and lie about my mother being dead
Why lie to your co-worker about your mother being dead?
It makes me feel like a real winner and I don't care one bit about the woman
You would avoid a lot of drama and resentment if you just forgive your co-worker and forget about the situation. Telling someone that your mom died when she's alive is wrong, so you shouldn't say that to people or they might think your manipulative or attention-seeking.
That's what I'm doing. It makes me feel happy and everyone knows I'm a winner for doing something like this.
I think your perspective on this is a bit warped, and you need to get help for this from a professional.  Trust me, nobody thinks you're a winner because of antisocial behavior like that.  They may, in fact, think this is a cry for help which it probably is.