|Minor Character: Miami|
|Family|| Calleigh Duquesne (daughter)|
Eric Delko (son-in-law)
Austin North (adopted grandson)
Patty North (adopted granddaughter)
|Portrayed By||John Heard|
|First Appearance||Double Cap|
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 occasions.