George Foreman's 23-year-old son has lawyered up in his domestic violence case -- hiring the famous attorney who represented cult-leader David Koresh during the '93 siege in Waco.
TMZ Sports has learned ... George Foreman V has teamed up with Dick DeGuerin ... who was called into action by Koresh's mother to negotiate with the FBI on David's behalf during the standoff.
In fact, just days before his death, Koresh sent DeGuerin a hand-written letter informing him that he had been in communication with god ... and relayed god's messages to the FBI.
DeGuerin was actually invited inside the compound during the 51-day standoff ... though things didn't exactly end well -- with Koresh (and roughly 80 followers) perishing in the fire/gun-battle that ended on April 19, 1993.
Now, we've learned DeGuerin is officially on-board for the Foreman case -- which stems from an incident in February when the legendary boxer's son was arrested in Texas for allegedly choking his wife during a domestic dispute.
GF5 -- who goes by the nickname "Red" -- is due in court with his lawyer later this week.