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About Gregory Powell (murderer)
- Gregory Ulas "Greg" Powell (August 2, 1933 – August 12, 2012) was an American criminal who kidnapped Los Angeles Police Department Officers Ian Campbell and Karl Hettinger on the night of March 9, 1963.
- Assisted by accomplice Jimmy Lee "Youngblood" Smith, Powell took the officers to an onion field near Bakersfield, California, where Officer Campbell was fatally shot.
- Infamously known as the "Onion Field" Killer, Powell's story was depicted in Joseph Wambaugh's 1973 non-fiction book, The Onion Field.
- The book was later made into a 1979 film adaptation of the same name in which Powell was portrayed by James Woods.
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