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… He was a sex addict, that was his problem,” his father told The Post. “I believe my son killed the prostitutes.” 
Nearly two dozen officers spent the weekend combing the Antioch, Calif., property where the couple hid Jaycee — and the two children she eventually had with Phillip — in a squalid compound of tents concealed by brush in their backyard for 18 years.
Phillip and Nancy Garrido are accused of turning Dugard into a sex slave after they plucked her from a bus stop near her South Lake Tahoe home when she was just 11 years old.
…
Police in Pittsburg are investigating whether Phillip Garrido, whose home is in nearby Antioch, is linked to several unsolved murders of prostitutes in the early 1990s. Antioch police are also looking into unsolved cases but declined further details.

See the full article from “NBC Dallas-Fort Worth”