Colonel John Casey (born Alexander Coburn) is portrayed by actor Adam Baldwin on the television show Chuck on NBC. Prior to the episode "Chuck Versus the Tic Tac," he was partnered with CIA agent Sarah Walker to protect Chuck Bartowski.

Quick facts: John Casey, First appearance, Last appearance...
John Casey
Chuck character
Adam Baldwin as John Casey
First appearance"Chuck Versus the Intersect"
Last appearance"Chuck Versus the Goodbye"
Portrayed byAdam Baldwin
Sterling Jones (young Coburn)
In-universe information
AliasAlexander Coburn (birth name)
NicknameAngel de la Muerte (Angel of Death)

Angel de la Vida (Angel of Life)

Sugar Bear
OccupationFormer or retired USMC officer[1]
Former NSA Agent
Briefly CIA-NCS agent[2]
Private intelligence operative[1]
Buy More "Greenshirt" & "Deputy Assistant Manager" (cover)
FamilyKathleen McHugh (former fiancee)
Alex McHugh (daughter)
Born1971 or earlier
AffiliationUnited States Marine Corps
National Security Agency
Operation Bartowski
Morgan Grimes (partner & roommate)
Sarah Walker (partner-employer)
Chuck Bartowski (partner-employer)
Brigadier General Diane Beckman (former commanding officer)
ExpertiseHighly trained in espionage tradecraft; hand-to-hand combat and firearms expert (particularly sniper rifles), and as a special forces officer, has been trained to resist extensive and brutal interrogation; champion of Quantify data process and liability programming.

In episode 21 of season 2, "Chuck Versus the Colonel," Major Casey was promoted and subsequently addressed as "colonel." In episode 10 of season 3, "Chuck Versus the Tic Tac," Colonel Casey was dismissed, adopting his cover of an overaged retail electronics salesman as his life. He was reinstated in "Chuck Versus the Other Guy" as a condition of his turning over the Ring director whom he captured in Paris.

He was dismissed again at the end of the season 4 "Chuck Versus the Cliffhanger", and was hired by Chuck and Sarah for their private spy operation. He left Carmichael Industries to pursue his love interest, Gertrude, in the series finale.