Perpetrators
Jack Twinning, age 35, and Bobby Augusta Davis, 27, were both career criminals with long histories of violent felonies and robberies. Twinning had been in and out of eight different federal prisons since age 16, including a 5-year stint at Alcatraz in which he killed another prisoner in self-defense. He had been released from a federal prison in Tallahassee, Florida 11 months prior to the shootings. Davis had been released from prison 8 months prior to the shootings and was on parole in Houston, Texas. Twinning and Davis met and became friends while in prison.
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