Andrew is known to be the angel of death who would take people to heaven after they pass on. He is introduced later on in the second season and occasionally helps with cases throughout the series.
Casework *Contains spoilers*Edit
Andrew was presented as a caseworker, "One of my best caseworkers," according to Sam the head angel, in the fifth season during. Episode six. "Beautiful Dreamer" He was sent to talk John Wilkes Booth out of assassinating President Lincoln.