Beloved 'NCIS' Star David McCallum Passes Away at 90

David McCallum, best known for his role as medical examiner "Ducky" on the TV show "NCIS," has passed away at the age of 90. McCallum, a gifted actor and author, died of natural causes at New York Presbyterian Hospital. He had a successful career in both television and film, earning Emmy nominations and Golden Globe nods. McCallum portrayed the eccentric yet skilled investigator, Dr. Donald "Ducky" Mallard, on "NCIS" for over 20 years. He is survived by his wife, children, and grandchildren. The network will include an "In memoriam" card in the previously announced 20th anniversary "NCIS" marathon. Donations in his memory can be made to the Marine Corps Scholarship Foundation.