Fitzgerald starred at linebacker for the Wildcats in the mid-1990s, helping to lead the team to a 10–1 regular season record in 1995 and a berth in the 1996 Rose Bowl, the school's second ever bowl appearance and the first since 1949. Known as "Fitz" to the Northwestern faithful, he personified the Wildcats' blue-collar, opportunistic defense. He recorded eleven tackles in Northwestern's victory over then #9 Notre Dame in South Bend which was the first Wildcats' victory over the Irish since 1962. Against #7 Michigan, Fitzgerald led the defensive effort with 14 tackles (including two tackles for loss) in the Wildcats' 19-13 win, the first for Northwestern in Ann Arbor since 1959. At one point during the 1995 season he was averaging over 13 tackles a game while on his way to Consensus All-Am