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- "Tell Courtney... Bad luck... It was worth a try."
- ―Walter Beckett's last words
Beckett was a member the Sixth Marines, having fought in the Okinawa campaign alongside Lieutenant Cole Phelps and Sergeant Jack Kelso as a rifleman. On their way home from the war, Beckett and his fellow Marines were shipped on board the SS Coolridge. They reflected on the unsatisfactory jobs they were returning home to, prompting Courtney Sheldon to coax them into stealing the ship's cargo of army surplus morphine to sell on the streets. With the exception of Kelso, they committed the theft, stealing half a million syrettes.
Upon returning to Los Angeles, Sheldon established a business arrangement with the Cohen Crime Syndicate, in order to sell the morphine to abortion clinics and hospitals. Beckett and Michael Driscoll assisted Sheldon by transporting the morphine to the Polar Bear Ice Company.
Event of L.A. Noire
However, there was a feud between the established crime boss Mickey Cohen and Sheldon. Cohen started selling the dangerous morphine to the addicted, gaining a considerable advantage on the city's drug trade. Sheldon, realizing this, pulled out of the deal with Cohen. C
Five gunmen were sent to a post office, where Driscoll and Beckett were located. Detectives Phelps, Earle and the LAPD arrived immediately. All five gunmen were killed in the resulting exchange of fire. However, when Phelps entered the building, he found Driscoll was killed and found Beckett lying in a pool of his own blood. He asked Phelps to relay a message to Courtney Sheldon, then died.
- Manifest Destiny (Killed)