The veteran performer spent more than 40 years on stage and screen.

His agency, MKS Talent Agency, confirmed the news Thursday, citing his wife, Mary Fields.

“Very grateful to have known and worked with you, sir.”

John Aylward on ‘ER’

John Aylward on ‘ER’.Chuck Hodes/NBCU Photo Bank

His first small-screen role was in the 1976 TV movieThe Secret Life of John Chapman.

Aylward was perhaps best known for playing Dr. Donald Anspaugh onERand former DNC chairman Barry Goodwin onThe West Wing.

“John was an amazing actor, a gentleman, and a wonderful friend,” Wyle wrote.

“He’ll be missed.”

“He truly was a class act,” La Salle wrote.

“A great gentle spirit who was always gracious and a joy to work with.

A very talented human being.”