"The Crown" actress Hadyn Gwynne has died. She was 66.

The British screen and stage star was recently diagnosed with cancer. 

Gwynne's agent, Alex Irwin, told The Associated Press she was "surrounded by her beloved sons, close family and friends" at the time of her death early Friday morning.

Prior to rising to fame, Hadyn taught English in Italy. Her breakout role came in the '90s on the sitcom "Drop the Dead Donkey."

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Gwynne played her most memorable roles later in her career. She starred in "Peak Practice" and played Queen Camilla in the royal satire "The Windsors" and lady-in-waiting Susan Hussey in "The Crown."

She also starred opposite Helen Mirren in the 2013 play "The Audience." Gwynne played Prime Minister Margaret Thatcher.

Mirren honored Gwynne in a statement to the AP, saying Gwynne was "a delight as a person and a consummate dedicated actress."

"She was both funny and serious at the same time, a brilliant balancing act that her whole career exemplified. We will miss her very much," Mirren added.

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Gwynne was nominated for numerous awards prior to her death. She received nominations for an Olivier Award and a Tony for her role in the musical "Billy Elliot."

She received three other Oliver Award nominations for her roles in "The Threepenny Opera," "Women on the Verge of a Nervous Breakdown" and "City of Angels."

According to The Associated Press, Gwynne was set to appear in a musical tribute, "Stephen Sondheim’s Old Friends," but withdrew during rehearsals in September due to "sudden personal circumstances."

The musical producer shared a statement with the outlet, calling Hadyn "a truly wonderful person, as well as a phenomenally talented actress and singer." Cameron Mackintosh noted that Friday's performance is dedicated to Gwynne.

The Associated Press contributed to this report.

Two juveniles have been charged after several slides at a Massachusetts park were doused with acid in this summer and four children were injured, the Hampden District Attorney Anthony Gulluni said.

The juveniles, whose identities cannot be released due to their ages, have been charged with four counts of assault and battery on a child with injury and assault and battery with a dangerous weapon as well as vandalism, Gulluni said. His office did not say whether the pair have been arrested.

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"Our collective effort to charge those we believe are responsible should make clear that protecting this community’s children is among our highest priorities," Gulluni said in a statement late Thursday. "Whether the threat and harm caused were intended as pranks or malicious acts, it will not be tolerated."

In June, police and firefighters responded to Bliss Park in Longmeadow for a report of a suspicious substance on the playground equipment. At about the same time, firefighters and emergency medical technicians went to a nearby home for a report of children with burns who had just left the park.

"I let the kids go play. I didn’t notice that there was liquid to collect at the bottom of the slide. I just assumed it was rainwater," their mother, Ashley Thielen, told Western Mass News in Springfield. "I didn’t really think much of it, and then, my baby, who is 1, just started crying. That was when I knew this liquid that they were around wasn’t water."

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The acid left mostly superficial blisters and swelling on her children’s skin, Thielen said, but it could have been much worse.

"The bottom of the slide, where it was, there was a good amount of it collected there," she said. "I was surprised he didn’t start splashing in it."

Authorities determined that someone broke into a storage room where chemicals are kept at the park’s swimming pool and stole muriatic acid. The acid, which can be used for cleaning or for maintaining a pool’s pH balance, was then poured on three slides, authorities said.