For the Changeling who replaced him, see Andrew Ellis (Changeling).
Andrew Ellis was a Human serving in Starfleet. He was married, and had one child. At some unknown point, he was captured and replaced by a Founder. Ellis was placed into stasis, and held there for seven years, until the Changeling required his body as part of a ploy to replace Captain Chakotay. He was then killed by the Changeling using a scalpel in an attempt to make it look like an animal attack. (VOY novel: Spirit Walk)