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William Ryan
Gender: Male   Male
Status: Institutionalized.
Portrayed by: Terry O'Quinn
 First Appearance
  ●   NCIS: Enigma (episode).
 Last Appearance
  ●   NCIS: Enigma (episode).
List of Appearances

William Ryan was a Colonel in the United States Marine Corps and a former commanding officer of Marine Gunnery Sergeant-turned-NCIS Special Agent Leroy Jethro Gibbs.

BiographyEdit

Pre-SeriesEdit

NCIS Season 1Edit

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