Barry Van Dyke
Barry Van Dyke is an American actor and the second son of actor and entertainer Dick Van Dyke and nephew of Jerry Van Dyke. He has one older brother, Christian, and two younger sisters, Stacy and Carrie Beth. He is best known to audiences as Lieutenant Detective Steve Sloan, a homicide detective and the son of Dr. Mark Sloan on Diagnosis Murder. In the show, the characters relatives were frequently played by reallife family members.
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Source: Wikipedia