Fitzgerald attended Southbridge High School, where he started as a 315 lb fullback. He also competed in the shot put. He accepted a football scholarship from Boston College, where he became a two-way tackle, playing both offense and defense during his three-year varsity career. In 1982, he was inducted into the Boston College Varsity Club Athletic Hall of Fame.
Professional career
Fitzgerald was selected by the Dallas Cowboys in the fourth round of the 1970 NFL Draft. The team played him first as a defensive tackle, before trying him at different offensive line positions. He was waived before the start of the season on September 2. He was later signed to the taxi squad. In 1971, he was a backup at offensive guard. In 1972, he was converted into a center during training camp and was the backup behind Dave Manders. In 1973, he took over the starting position from Manders, at the time, he was taller than the prototype center. In 1974, he missed 2 games, but was able to start most of the season while limited with an injured knee and an injured elbow. In 1975, head coachTom Landry re-introduced to the NFL the shotgun formation. Fitzgerald took great pride in making it work, with his ability to snap the ball 7 yards back without looking. In 1977, he missed 2 games with knee and ankle injuries. He re-injured the knee during a practice in December, but still managed to play throughout the playoffs. In 1978, he missed 2 games while battling through ankle, shoulder and back spams problems. In 1979, Fitzgerald named the offensive line as the "Four Irishmen and a Scott", referring to himself, Pat Donovan, Jim Cooper, Tom Rafferty and Herb Scott. In 1980, he missed 2 regular season games and 3 playoff contests with shoulder and knee injuries. Robert Shaw was his replacement. On August 31, 1981, he was placed on the injured reserve list, he was i. On January 11, 1982, he announced his retirement due to injuries and Tom Rafferty being already entrenched at the starting center position. Fitzgerald never appeared in a Pro Bowl, but still became a central part of a strong offensive line in Dallas for most of the decade. He helped the Cowboys win 2 Super Bowl championships and make playoff appearances every season except one during his time. He played in 138 games over 10 NFL seasons.
