Tim Maguire worked closely alongside Alphonso Mackenzie onboard the S.H.I.E.L.D. Aircraft Carrier Iliad. During the HYDRA Uprising he and Mackenzie were attacked by undercover HYDRA operatives; Maguire was shot in the arm.
Maguire, Mackenzie and other S.H.I.E.L.D. agents were held hostage by HYDRA; Maguire complained that he could no longer feel his injured arm. Eventually the Lead HYDRA Agent asked who the head engineer on the ship was. Knowing that Mackenzie was the head engineer, Maguire lied and claimed to be him in an attempt to protect his friend. Mackenzie quickly came to his friend's defence and told the HYDRA Agent that Maguire was lying.
Without hesitating, the HYDRA Agent shot Maguire twice in the chest, killing him, as he claimed he did not like liars.