Fitzgerald played youth AAA hockey with the Middlesex Islanders out of North Andover MA.

[2] Fitzgerald joined the Boston College Eagles ice hockey team for the 2015–16 season.

[5][6][7] After being a healthy scratch for six straight games during the 2022–23 season, Fitzgerald was placed on waivers by the Sabres on January 10, 2023, upon the return of defenseman Henri Jokiharju from injury.

He made his Stanley Cup Playoffs debut in Game 4 of the First Round against the Boston Bruins, subbing in for the injured Aaron Ekblad.

As a result of his father's career, he grew up in Florida and Tennessee, before his family settled in North Reading, Massachusetts.