"Rosier is dead ... He preferred to fight rather than come quietly and was killed in the struggle."
-- Barty Crouch, Sr. (GF30)
During the trial of Igor Karkaroff at the Ministry, he gave Rosier’s name, not realizing he was already known and deceased.
Rosier's age is unknown, but there was a Rosier mentioned by Dumbledore as a "devoted friend" of Tom Riddle's during his first rise as Dark Lord (HBP20). Whether that was the same Evan Rosier killed by Moody, or whether there was both an older and younger Rosier in the same family, is uncertain.
Violent duelist against the Aurors.
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"Evan Rosier" from Harry Potter Wiki