Hollywood has said goodbye to some big stars in 2021.

Months after the Saved by the Bell reboot premiered on NBC’s streaming service in November 2020, one of the original show’s stars, Dustin Diamond, died in February 2021, following a battle with cancer.

“We are saddened to confirm Dustin Diamond’s passing on Monday, February 1st, 2021 due to carcinoma. He was diagnosed with this brutal, relentless form of malignant cancer only three weeks ago,” the actor’s rep confirmed in a statement to Us Weekly. “In that time, it managed to spread rapidly throughout his system; the only mercy it exhibited was its sharp and swift execution. Dustin did not suffer. He did not have to lie submerged in pain. For that, we are grateful.”

His costars, including Mario Lopez, spoke out and and shared tributes via social media following his passing. “Dustin, you will be missed my man. The fragility of this life is something never to be taken for granted. Prayers for your family will continue on,” the actor wrote via Instagram.

Harry Potter star Paul Ritter — known for his role as Eldred Worple in Harry Potter and the Half-Blood Prince — died in April 2021 after battling a brain tumor. “It is with great sadness we can confirm that Paul Ritter passed away last night,” his agent confirmed in a statement to Us Weekly. “He died peacefully at home with his wife Polly and sons Frank and Noah by his side. He was 54 and had been suffering from a brain tumor.”

The statement continued, “Paul was an exceptionally talented actor playing an enormous variety of roles on stage and screen with extraordinary skill. He was fiercely intelligent, kind and very funny. We will miss him greatly.”

These aren’t the only stars we’ve lost so far this year. Fans have also said goodbye to some industry legends and trailblazers — including TikTok stars and musicians — among others. Scroll through our gallery for a full list of celebrity deaths in 2021.

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