and ended up killed. >> i loved my father dearly. and he took him away from me. >> reporter: the killer spreading fear, making taunting phone calls to police. >> you're never gonna catch me you dumb [ expletive ]. >> reporter: and victims. >> gonna kill you. >> reporter: we're learning detectives painstakingly examined online dna information and family trees for matches with dna samples from crime scenes, and finally tracked down deangelo. they wouldn't release which genealogy website they used or who related to deangelo submitted their dna. natalie brunell, abc news, los angeles. >>> the fbi is now offering $20,000 for information leading to the arrest of a cop killer in maine. the nationwide manhunt is still under way for john williams, but investigators say they're right now focusing on a wooded area west of bangor, maine. williams disappeared two days ago after police say he killed a deputy, stole his car, and robbed a store. >>> american airlines is facing a lawsuit after a...