Nothing is known about Cyrus's life before the outbreak, except that he lived somewhere in Manhattan, and worked as an associate for Stoneheart.
Season 3 Edit
Cyrus deines access to the ship to Eldritch Palmer. Eldritch Palmer fires him but still dosen't let him even though he is still fired. When Eldritch Palmer comes back to the ship all the crew members were killed it is unknown if he survived.