Colonel Will Ryan is a fictional character portrayed by Terry O'Quinn in the TV series NCIS.
In the first episode they appeared in, titled Enigma (season 1), they were 51 years old.
They appear in 1 episodes out of a total of 467 aired so far
Episodes1
Enigma
episode S1.E15 february 2004A Marine colonel disappears during an ambush in Iraq, as does $2M in cash; he re-enters the US under an assumed name; the FBI seeks him, and so does Gibbs, with whom he served while on active duty. Gibbs finds him and figures it out.