Peter Donat -- who appeared on several popular TV shows during is 50-year career and played Mulder's father on "
The X-Files" -- has died ... according to his wife.
He reportedly died Monday at his home in Point Reyes Station, California from complications of diabetes.
![The X-Files Actor Peter Donat Dies at 90](/images/files/2018915143513330905810.jpg)
Donat began his career in 1953 and was a familiar face on television for decades. He guest-starred and had recurring roles on shows like "Mission: Impossible," "The F.B.I.," "The Waltons," "Hawaii Five-O," "Hill Street Blues" and "Murder, She Wrote."
Peter had a notable role in the famous "Who Shot J.R.?" episode of "Dallas" in 1980 ... and played William Mulder, Agent Mulder's dad, on 6 episodes of "The X-Files." His film credits include "The Godfather Part II," "The War of the Roses" and "The Game."
The veteran actor had a long career on Broadway as well, making his debut in 1957.
He was 90.