|Minor Character: Miami|
|Family|| Calleigh Duquesne- (daughter)
Eric Delko (Son-in-law)
Austin North (Adopted Grandson via Calleigh and Eric)
Patty North (Adopted Granddaughter via Calleigh and Eric)
|Portrayed By||John Heard|
Kenwall "Duke" Duquesne is a lawyer and also the father to CSI/Detective Calleigh Duquesne.
He has a drinking problem which has brought him into conflict with Calleigh and the CSI on a few occassions.