Question: When was the head coach of 1955 Mississippi State Maroons football team born who left after 1955 college football season?

Context paragraphs:
1952 Mississippi State Maroons football team: The 1952 Mississippi State Maroons football team represented Mississippi State College during the 1952 college football season.  It was the first season as head coach for Murray Warmath, and also for quarterback Jackie Parker, who transferred to Mississippi State from Jones County Junior College.  Parker rushed for 16 touchdowns in 1952, a school record that stood until Vick Ballard broke it in 2010.  Parker would win his first of two SEC "Player of the Year" honors by the Nashville Banner.

1948 Mississippi State Maroons football team: The 1948 Mississippi State Maroons football team represented Mississippi State College during the 1948 college football season.  This was the only of head coach Allyn McKeen's nine seasons that did not end in a winning record for the Maroons.  Despite the strong record — his .764 (65–19–3) winning percentage is the best in school history — McKeen was fired after the season.  The Maroons, who had won 7 or more games in six of McKeen's nine seasons, would not post another 7-win season until 1963.

1957 Mississippi State Maroons football team: The 1957 Mississippi State Maroons football team represented Mississippi State College during the 1957 college football season.  The Maroons finished the season ranked in the AP Poll for the first time since 1942 and would not finish another season ranked until 1974.  Head coach Wade Walker was named SEC Coach of the Year.

1955 Mississippi State Maroons football team: The 1955 Mississippi State Maroons football team represented Mississippi State College during the 1955 college football season.  After the season, head coach Darrell Royal left to take the job at Washington. .  Halfback Art Davis was named to the FWAA/Look Magazine All America Team and voted their College "Player of the Year".  Guard Scott Suber was named to the first team NEA All America Team.

1956 Mississippi State Maroons football team: The 1956 Mississippi State Maroons football team represented Mississippi State College during the 1956 college football season.  The Maroons finished 4–6 in head coach Wade Walker's first season.

1949 Mississippi State Maroons football team: The 1949 Mississippi State Maroons football team represented Mississippi State College during the 1949 college football season.  This was the first season under new head coach Arthur Morton, and the Maroons failed to score more than 7 points in any game all year.

Darrell Royal: Darrell K Royal (July 6, 1924 – November 7, 2012) was an American football player and coach.  He served as the head coach at Mississippi State University (1954–1955), the University of Washington (1956), and the University of Texas (1957–1976), compiling a career college football record of 184–60–5.  In his 20 seasons at Texas, Royal's teams won three national championships (1963, 1969, and 1970), 11 Southwest Conference titles, and amassed a record of 167–47–5.  He won more games than any other coach in Texas Longhorns football history.  Royal also coached the Edmonton Eskimos of the Canadian Football League (CFL) for one season in 1953.  He never had a losing season as a head coach for his entire career.  Royal played football at the University of Oklahoma from 1946 to 1949.  He was inducted into the College Football Hall of Fame as a coach in 1983.  Darrell K Royal – Texas Memorial Stadium in Austin, Texas, where the Longhorns play their home games, was renamed in his honor in 1996.

1941 Mississippi State Maroons football team: The 1941 Mississippi State Maroons football team represented Mississippi State College during the 1941 college football season.  This season gave Mississippi State its only SEC football championship, which was won in a winner-take-all game over Ole Miss.  The Maroons were unable to participate in the post-season due to the wartime airport and train station closings.

1954 Mississippi State Maroons football team: The 1954 Mississippi State Maroons football team represented Mississippi State College during the 1954 college football season.  This was the first season as head coach for Darrell Royal, who had previously served as an assistant for the Maroons.  Royal would later win three national championships as head coach of Texas.  Center Hal Easterwood was named to the FWAA/Look All-America team.  Halfback Art Davis was named SEC "Player of the Year" by the Nashville Banner and Atlanta Constitution.

1939 Mississippi State Maroons football team: The 1939 Mississippi State Maroons football team represented Mississippi State College during the 1939 college football season.  The Maroons finished 8–2 in head coach Allyn McKeen's first season.

Supporting paragraphs: 1955 Mississippi State Maroons football team Darrell Royal
Answer: July 6, 1924