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Investigation Discovery

The Hillside Strangler Task Force receives a phone call from Bellingham, Wash., providing a breakthrough; prosecutors enlist psychiatrist Dr. Martin Orne to help untangle the devastating truth behind Bianchi's claims.

The Hillside Strangler

The Stranglers

Ken Bianchi claims responsibility for the Hillside Strangler murders in Los Angeles, but he blames the murders on his multiple personality "Steve" and his cousin Angelo Buono; investigators must determine if he's credible or a pathological liar.

Multiple Personalities

In 1979, police apprehend Kenneth Bianchi for the murders of two University of Washington students; his arrest shocks the world of psychiatry and sparks new life into one of America's most notorious serial killer investigations.

The Hillside Strangler: Mind of a Monster

Steve Did It

In Bellingham, Wash., police charge Ken Bianchi with the murders of two coeds later, in explosive recorded interviews, Bianchi claims to know the identity of L.A.'s notorious "Hillside Strangler" -- but some suspect he may be talking about himself.

S1 E1 | Steve Did It