Looking for Betty look alikes

She sat across from me, short blonde hair, intense blue eyes. I had not been in her city for several years and we were enjoying a beer and catching up with each other's lives.

I think we were on our second beer when I remembered what I wanted to tell her.
"You remember how I used to tell you when I saw people who looked like you?"
"I remember."
"I haven't seen any in a long time."
She took a drink of her beer, smiled a chilling smile and said. "That's because I have killed them all."

And she smiled again.