KALEY Cuoco broke down in tears 18 years after her costar John Ritter’s sudden death.

Fans also "sobbed" and mourned the loss of the actor during the new ABC doc, which aired on Wednesday.

During the special Superstar, John's former costar Kaley reflected on his passing.

The beloved actor sadly passed away after he was rushed to the hospital while on set of his sitcom 8 Simple Rules.

The pair starred as father and daughter on the sitcom, which aired on ABC from 2002-2005.

Kaley, 36, emotionally recalled going to set the day after John had passed.

After guest star Henry Winkler recalled everyone gathering to discuss the "sudden" and "shocking" news, Kaley shared her memories from the day.

While wiping tears away from her eyes, the Big Bang Theory alum said: “Everyone was just crying, bawling and then people started telling stories."

She continued: "I’ll never forget, there was the mailman at Warner Bros. and he was like, ‘I’d like to speak.’

"He goes, ‘I used to deliver the mail here. John would always say hi to me.’

"And I was like, ‘Of course he did!”’

'I MISS HIM'

As the special aired, fans rushed to Twitter to express how much they miss the late actor.

One person wrote: "I just watched a special on John Ritter, and I really can’t believe how long it’s been since he died."

Another added: "Gosh, I miss John Ritter."

A third chimed in: "I was never going to not watch this John Ritter special. Man, do I miss him."

An additional fan praised the doc, writing: "This show #SuperstarABC with #JohnRitter is amazing. What a treasure lost WAY too soon."

While many viewers agree that they "miss John," a following person added: "Oh how I miss #JohnRitter and his laughter."

"That John Ritter special on ABC was terrific. But again, I’m too emotional for all that right now," another person wrote.

Fans continued to mourn John's passing, with one Twitter user writing: "#JohnRitter I'm remembering, smiling, laughing, n crying! I didn't know how much the loss of John Ritter hurt my soul."

Others praised his acting talent as a fan wrote: "Watching Superstar: John Ritter tonight. I'm still angry that he died so young. One of the greatest actors to have ever graced a television screen."

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GONE TOO SOON

John, an Emmy and Golden Globe award-winning actor and comedian, passed suddenly from what doctors claimed was an "unavoidable" death.

On September 11th, 2003, John was on set filming 8 Simple Rules when all of a sudden he began suffering from nausea, vomiting, and chest pain that led him to feel faint.

Following his death, his widow Amy Yasbeck challenged the notion that her husband couldn't have been saved years later in a 2008 court proceeding.

The California native received care from two doctors before his passing, one who administered a body scan in 2001, and one emergency room doctor that cared for him the night he died.

Their attorneys alleged that their clients did everything in their power to save John, but were ultimately unsuccessful.

Prior to the 2008 trial, Amy and the rest of John's family received more than $14 million in settlements according to court records, including $9.4 million from the hospital where he died, Providence St. Joseph Medical Center in Burbank.

Doctors at St. Joseph's treated the comedian as if he was having a heart attack, but found out right before he died that he was actually suffering from an aortic dissection, a tear in the largest blood vessel in the body.

AMY'S FIGHT

Amy took a stand after neither doctors nor the hospital made any admittance of guilt or apologized for their actions on the eve of his death.

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“You can’t treat my kid’s dad for something and kill him in the process,” she said at the time.

“I think the money will show how angry the jury will be about what happened to John and what could happen to them.”

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