Diamond was born January 7, 1977. He entered the spotlight at an early age. In fact, he was just 10 years old when Good Morning, Miss Bliss—in which he first played Screech—premiered.
"The hardest thing about being a child star is giving up your childhood," he said in a 2013 episode of OWN's Where Are They Now?. "You don't get a childhood really. I mean, you're a professional. You've got to know your lines, and rehearse and practice. You know, it was making sure that you were the funniest and the best that you could be because if you weren't funny you could be replaced."
From 1987 to 2000, Diamond portrayed the character on Good Morning, Miss Bell; Saved By the Bell, Saved By the Bell: The College Years and Saved By the Bell: The New Class. He was in his early 20s when the series ended.
Over the next few years, Diamond made appearances in a number of movies, including Made (2001), Dickie Roberts: Former Child Star (2003) and American Pie: Presents: The Book of Love (2009).
He also took part in a number of reality TV series, including The Weakest Link (2001), Celebrity Boxing 2 (2002), Hollywood Squares (2003) Celebrity Fit Club (2007-2008) and Celebrity Big Brother (2013).
In 2006, Diamond released a sex tape, which he described on Where Are They Now? as the thing he was "most embarrassed about."
"Looking back now, in my 30's, I realize that was really dumb," he said on the OWN series. "I definitely got some money off of it, but it wasn't worth what the fallout was."
In 2009, he also released the book Behind the Bell, which he considered "another disappointment."
"I was a first-time author, so they had a ghostwriter," he told the docuseries. "I talked to a guy a few times, so the book has some truth in it, and a lot of the stories were just kind of throwaways."
Just a few years later in 2016, Diamond made headlines again. According to Reuters, the actor was sentenced to four months in jail after being convicted of carrying a concealed weapon and disorderly conduct in an incident in which he was accused of stabbing someone at a Wisconsin bar. He was released after three months.
"When I had my pocketknife like this and the blade was right here, and the guy came from around me and grabbed my throat and so he nicked his arm on the tip of it," he told Mario Lopez on Extra in 2016. "It was a Band-Aid—the most expensive Band-Aid I've ever bought."
Diamond's rep reflected on his "history of mishaps" and "unfortunate" events in the statement to E! News.
"We want the public to understand that he was not intentionally malevolent. He—much like the rest of those who act out and behave poorly—had undergone a great deal of turmoil and heartache. His actions, though rebukeable, stemmed from loss and the lack of knowledge on how to process that pain properly. In actuality, Dustin was a humorous and high-spirited individual whose greatest passion was to make others laugh. He was able to sense and feel other peoples' emotions to such a length that he was able to feel them too—a strength and a flaw, all in one."
On Jan. 14, 2020 Diamond's team announced his cancer diagnosis. "At this time we can confirm that Dustin does have cancer," a statement posted to Facebook read. "Dustin will disclose more information once it is available and a plan moving forward is made." Later that month, his reps confirmed he had started chemotherapy. He passed away a few weeks later.