Henry Reagan is a retired Police Commissioner and the father of Frank, Grandfather of Danny, Erin, Joe (deceased) and Jamie and Great-Grandfather to Nicky, Sean and Jack. Henry is the Reagan patriarch.
His childhood during the 1930s was hard due to his father's alcoholism and inability to hold a job. Henry was a Marine in World War II and Korea then joined the NYPD in 1952. Like his grandson, Danny, Henry is socially conservative and hates the political correctness of modern law & order. His wife Betty died December 2, 2001.
Henry had a hip replacement before the pilot (1x01) and has difficulty getting up from a seat the first three episodes.
He had "a war cholesterol" before "knowing when to retreat". (1x04)
He used to play handball and now likes to watch it, he taught Danny how to play as well. (1x05)
Season 2 Edit
Len Cariou, separated in age from Selleck by only six years, wears make-up and a dental prosthetic for the part of Henry .