BTK serial killer is prime suspect in two more unsolved murders, police say

Inquiry into 1976 disappearance in Oklahoma and 1990 murder in Missouri have led authorities to believe killer may be involved

Kerri Rawson's father - the BTK serial killer - is serving 10 life terms in prison, but Rawson does not think authorities should give up investigating whether he killed more people than they already know.

The clearest indication that authorities strongly suspect more victims of Dennis Rader may await discovery, came this week when police dug the ground near a Kansas home he lived in with Rawson.