Crewman Fitzpatrick was a 24th century Starfleet crewman assigned to the command division aboard the USS Voyager under Captain Kathryn Janeway. Fitzpatrick became stranded in the Delta Quadrant along with the rest of the crew of Voyager in 2371.
He was working on the aft station of the bridge when Voyager tried to contact the "other ship", not knowing that this ship was a reflection of itself (VOY: "Parallax") and when the ship discovered a Class M planet in a red dwarf system. (VOY: "Time and Again")
He visited the mess hall when a non-corporeal being took over the control of the ship and brought Voyager into a nebula (VOY: "Cathexis") and when Neelix presented Tuvok his "plomeek soup à lá Neelix". (VOY: "Faces")
He visited the mess hall and was surprised by Chakotay's reaction about the dispute with Kenneth Dalby. Later that day he had a drink with a fellow crewmember in the sciences division, from which Chell took the drink when he passed the mess hall on his run through the ship. (VOY: "Learning Curve")
Fitzpatrick worked on the bridge when an away team led by Captain Janeway found the 37's and Commander Chakotay informed them that several life signs approached their location. Later he was among the crewmembers in the mess hall who chatted with the 37's. (VOY: "The 37's")
Fitzpatrick was among the Starfleet officers who took part in the bets of Tom Paris' Radiogenic Sweepstakes. He was present on the holodeck at Chez Sandrine's when Commander Chakotay stopped the bets. (VOY: "Meld")
When the crew was marooned on Hanon IV, Fitzpatrick was a member of the team which tried to get Kes and Neelix back to the ship. They were successful and he survived the ensuing fight against the natives and the attack of the land eel. (VOY: "Basics, Part I", "Basics, Part II")
He served on the bridge when Voyager discovered a class 17 nebula in 2373 (VOY: "Flashback") and passed Commander Chakotay in a corridor when the Commander ordered The Doctor to prepare Kes for a transport. (VOY: "Sacred Ground")