Jim Marshall was a professional baseball player who played for several teams during his career. He was primarily a relief pitcher and played in the major leagues for over a decade. Marshall began his career with the Baltimore Orioles in the late 1950s and played for them for a few seasons before being traded to the Detroit Tigers. He played for the Tigers for a few years before being traded again, this time to the Seattle Pilots.

Marshall played for the Pilots for one season before the team moved to Milwaukee and became the Brewers. He played for the Brewers for a few seasons before being traded to the Chicago Cubs. Marshall played for the Cubs for several seasons and was a key member of their bullpen during that time. He was known for his durability and consistency, and was often called upon to pitch in high-pressure situations.

Marshall's best season came in 1974, when he posted a 2.42 ERA and recorded 21 saves for the Cubs. He was named to the National League All-Star team that year and finished 10th in the voting for the Cy Young Award. Marshall continued to pitch for the Cubs for a few more seasons before being traded to the Minnesota Twins.

Marshall played for the Twins for a few seasons before retiring from baseball in 1979. He finished his career with a 3.14 ERA and 188 saves, and was one of the most reliable relief pitchers of his era. Marshall was known for his work ethic and his ability to pitch in any situation, and was respected by his teammates and opponents alike.

After retiring from baseball, Marshall worked as a coach and scout for several teams. He was inducted into the Chicago Cubs Hall of Fame in 1987, and his number 31 was retired by the team in 1993. Marshall passed away in 2015 at the age of 72, but his legacy as one of the best relief pitchers of his era lives on.