- Former Deputy U.S. Marshal, and brother of Mike McNamara. They helped instigated the nationwide manhunt that led to the arrest and ultimate execution of Kenneth McDuff in 1992.
- Elected Sheriff of McLennan County (TX) in 2012.
- Uncle of actor, screenwriter and director Taylor Sheridan, McNamara acted as consultant to Jeff Bridges for his lawman role in Hell or High Water (2016) which was written by Sheridan.
- Was an active U.S. marshal during the 51-day siege at a Branch Davidian Complex outside Waco, Texas (1993).
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