Pat Harrington Jr., the actor who played superintendent Dwayne Schneider on CBS' "One Day at a Time," died Wednesday at the age of 86.

Tresa Harrington, the actor's daughter reported the news of her father's passing on Facebook early Thursday morning.

"Dear Friends, it is with the most unimaginable pain and sadness, that I tell you my father, Pat Harrington, Jr. passed away at 11:09 PM this evening," she wrote in a post accompanied by a photo of her father on the CBS sitcom.

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"We were all with him today and tonight: crying, laughing and loving him. This is the single most heart wrenching and physically painful thing, I've ever had to endure," her post continued. "I know many of you have lost parents and loved ones, and now I know what it's like to feel the kind of sadness and void that will never be filled but only softened with the passing of time. My heart is broken to pieces and I will cry and cry until I just won't. Love to you all! And as we head into this year, never be afraid to tell the people you love, that you love them."

"One Day at a Time" aired for nine seasons on CBS between 1975 and 1984. Bonnie Franklin starred on the series as a single mother raising her two daughters, played by Mackenzie Phillips and Valerie Bertinelli. Harrington won a Golden Globe in 1981 and an Emmy in 1984 for his work on the show.

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Harrington's numerous other TV credits include "The Beverly Hillbillies," "The Flying Nun," "F Troop," "The Munsters," "The Rookies," "McMillan and Wife," "The Wayans Bros.," "Murder, She Wrote" and "Curb Your Enthusiasm."