|Plot details follow, read at your own risk.|
- "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 their unsatisfactory jobs to return home to, prompting Courtney Sheldon convincing everyone to stealing the cargo of army surplus morphine with the intent 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 Mickey Cohen and Sheldon. Cohen started into selling the morphine to the addicted, gaining a considerable advantage on the cities drug trade, since the morphine required no preparation. Sheldon, realizing this, pulled out of the deal with Cohen. Cohen retaliated by ordering the assassinations of the Marines involved in the morphine heist.
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)