In 1958, Chuck Howley was selected seventh overall by Chicago out of West Virginia, but his early career was derailed by a severe knee injury that sidelined him for the entire 1960 season. Unsure whether his body would hold up, Howley considered stepping away from football altogether before a 1961 trade to Dallas offered a second chance. That move to Texas saved his career, transforming him from an injury-prone linebacker into one of the most dynamic playmakers in franchise history.

Inserted into Tom Landry's newly established "Doomsday Defense," Howley excelled after transitioning to the weakside linebacker position, where his exceptional speed, lateral agility, and coverage instincts thrived. Between 1965 and 1971, Howley received six Pro Bowl nominations over a seven-year period, notably earning five consecutive First-Team All-Pro honors from 1966 to 1970. His proficiency in dropping into coverage and discerning passing lanes contributed a significant and dangerous dimension to Landry's intricate defensive schemes, rendering him an indispensable component of the defensive front.

Apart from his personal achievements, Howley functioned as the strategic driving force behind those early Landry units during the team's evolution from an expansion team to a consistent contender. His thorough knowledge of opposing offenses enabled him to anticipate plays, often disrupting sweep plays in the backfield and applying pressure to perimeter receivers. He led a tenacious linebacking group alongside Lee Roy Jordan and Dave Edwards, setting a physical benchmark that characterized Dallas football in the late 1960s and early 1970s.

Howley's postseason exploits sealed his legacy, most notably during Super Bowl V against Baltimore. Despite the Cowboys falling in a 16–13 heartbreaker, Howley put together an iconic individual performance, picking off two passes and forcing a fumble. His effort earned him Super Bowl MVP honors—making him the first defensive player, and to this day the only player from a losing team, to capture the award. Bittersweet as that milestone was, Howley and the Doomsday Defense got their redemption the following year, smothering Miami 24–3 to claim victory in Super Bowl VI.

He remained a steady leader in Dallas through the 1973 campaign before finally hanging up his helmet after 13 years in blue and silver. In his 13 seasons with the Cowboys (1961–1973), Howley appeared in 165 games, recording 24 interceptions and 17 fumble recoveries in Big D. The franchise honored his decade-plus of defensive brilliance by adding him to the Cowboys Ring of Honor in 1977, setting the stage for his long-awaited, overdue induction into the Pro Football Hall of Fame in 2023.