Kenneth Allen McDuff (March 21, 1946 – November 17, 1998) was an American serial killer.
He was convicted in 1966 of murdering 16-year-old Edna Sullivan, her boyfriend, 17-year-old Robert Brand, and Brand's cousin, 15-year-old Mark Dunnam, who was visiting from California.
They were all strangers whom McDuff abducted after noticing Sullivan.
She was repeatedly raped before having her neck broken with a broomstick.
McDuff was given three death sentences that were reduced to life imprisonment consequently to the 1972 U.S.
Supreme Court ruling Furman v.
Georgia.
He was executed in 1998.
McDuff was given a new death sentence and executed for a murder committed after his release, and is suspected to have been responsible for many other killings.