He was 75.
Aylward died Monday of natural causes, Stubbs told CNN.
“He was a wonderful actor and a phenomenal human being,” Stubbs said.
Alyward, a Seattle native, was best known for playing the stern but fair Donald Anspaugh on NBC’s “ER” and Barry Goodwin on “The West Wing.”
Among his first credits is a recurring role on “Northern Exposure.” Other work included roles on shows like “Family Law,” “The Practice” and “Mad Men.”
Aylward appeared in more than 70 episodes of “ER” over the show’s 15 seasons. Through that, especially at the height of the show’s popularity, when it would regularly notch roughly 30 million viewers per week, Aylward became a highly recognizable face.
“When I was doing “Death of a Salesman” at ACT (in 1998), I was still appearing frequently on ‘ER,’ and it was right after the season in which Anspaugh’s last had died. It was a Monday (off-day for theater actors), and I was in the checkout line at the grocery store, and this woman came running up to me and said, ‘Excuse me, I’m sorry to bother you, I’ve been out of the country .. . what happened to your end?’ A’d I said, ‘Oh, he died,'” Aylward told the newspaper. “The lady says ‘Oh, no!’ and I said, ‘Yeah, we buried his ass last week! and the girl checking out the groceries turned as white as a sheet, so I had to stop and say, ‘We’re talking about a TV show!’ I could tell she was thinking ‘Who is this heinous man who talks about the death of his kid like that.'”
Roles in the TV shows “Briarpatch” and “Yellowstone” were among Alyward’s final credits.