Michael Eddington was a Starfleet security officer assigned to station Deep Space 9. Eddington became disillusioned with Starfleet and the Federation, and joined the Maquis. He was captured, but was killed during a special operation while serving his sentence. Eddington was born in Canada.
Eddington was stationed to DS9 in 2371 after first contact with the Dominion. This was done in part to increase Starfleet control of the station's security operations, as Starfleet did not have full confidence in the current security chief, Odo.
In late 2372, Eddington defected to the Maquis rebels by using his position within Starfleet to hijack a shipment of class-four industrial replicators headed to the Cardassian Union from the Federation. He diverted the attention of Captain Sisko by raising suspicions about the business activities of Kasidy Yates, who was involved in supplying the Maquis with non-military supplies during meetings in the Badlands. By the time the USS Defiant returned from the Badlands, Eddington and the replicators had disappeared into Maquis territory.