I read his daughter’s book “A Serial Killer’s Daughter”. All the killings were carried out during her childhood. Interesting read. Actually I think they got her DNA from college medical exam to compare and that helped catch him.
Not so certain on the DNA; his need for publicity is what got him. He called one of the detectives on the case while he was still on the outside and asked him if floppy disks could be traced. Of course he detective said no. He then proceeded to mail a floppy disk with some info on it, source analysis traced the disk to the church he was working at, voila - captured BTK.
She said she forgives but I don’t feel sh is the one to forgive.