'One Day At a Time' Star Pat Harrington Jr. Dead at 86

This video is unavailable because we were unable to load a message from our sponsors.

If you are using ad-blocking software, please disable it and reload the page.

Pat Harrington Jr., best known for playing the role of Dwayne Schneider on One Day At a Time, died Wednesday night. He was 86.

"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," his daughter, Tresa Harrington, announced on her Facebook following her father's passing. "We were all with him today and tonight: crying, laughing and loving him. This is the single most heartwrenching and physically painful thing I've ever had to endure."

PHOTOS: Stars We've Lost

"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," she continued. "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."

Dear Friends, it is with the most unimaginable pain and sadness, that I tell you my father, Pat Harrington, Jr. passed...

Posted by Tresa Harrington on Thursday, January 7, 2016

According to another post written by Tresa in November, the late actor suffered from Alzheimer's disease and "a small hemorrhage in his brain," which resulted in his deteriorating health.

It is with a broken heart that my father is succumbing to Alzheimer's. After falling three weeks ago, a small hemmorage...

Posted by Tresa Harrington on Saturday, November 28, 2015

Harrington, the son of Broadway song-and-dance man Pat Harrington Sr., was born in New York City and previously served in the Air Force. He got his start in acting in the 1950s, appearing on shows like Make Room for Daddy, The Bing Crosby Show, The Munsters and The Man from U.N.C.L.E. His role in One Day At a Time -- which landed him a Golden Globe and an Emmy -- made him a household name. He was a fan favorite on the CBS show that aired from 1975 to 1984.

As his comedic handyman character on One Day At a Time would say, "Please always remember and don't ever forget..."