He is based on Baltimore Police Department Shift Lieutenant Gary D'Addario, a member of the BPD homicide unit described in David Simon's book Homicide: A Year on the Killing Streets which served as the inspiration for the series as a whole.
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Gee enjoys cooking and is an excellent Hearts player, as revealed in the episode "All Through the House".
Rotten appeared in an uncredited, non-speaking role on the first episode of the show Homicide: Life on the Street, entitled "Gone for Goode," seen being questioned in "The Box" while Lieutenant Al Giardello gives Det. Tim Bayliss his introductory tour of the Homicide Unit.
D'Addario is best known as the shift commander featured in David Simon's Homicide: A Year on the Killing Streets book and was the inspiration for the character of Al Giardello seen on NBC's Homicide: Life on the Street.