11:12 AM PT -- 13-year-old actress Laurel Griggs appears to have died from an asthma attack, according to purported members of her family who posted about it on Facebook.
David Rivlin, who claims to be Laurel's grandfather, said she suffered a "massive asthma attack" that ultimately took her life. He wrote, "It’s with heavy heart that I have to share some very sad news. My beautiful and talented granddaughter, Laurel Griggs, has passed away suddenly from a massive asthma attack." He added, "Mount Sinai was valiant in trying to save her but now she’s with the angels."
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David went on to say that a celebration of life ceremony was set to take place Sunday -- this following a funeral service that happened just last Friday. The Rivlin family says they will be holding a small, intimate shiva -- a Jewish mourning period -- at Laurel's aunt's home.
One last thing -- David says that Laurel's school -- the public Clinton School in NYC -- closed last week for half a day in Laurel's honor ... something he said he didn't believe had ever happened in the city before.
Laurel Griggs, a 13-year-old actress on the rise with credits that include 'SNL' and a Tony Award-winning Broadway play, is dead.
The cause of death is unknown and something of a mystery. She died on November 5 but the death didn't surface until this weekend. No cause of death was revealed.
Laurel made her Broadway debut in 2013 at age 6 as Polly in "Cat on a Hot Tin Roof" opposite Scarlett Johansson. She's best known for her role in "Once" ... which she performed for 17 months between 2013 and 2015. "Once" also won a Tony.
Laurel made appearances on 2 episodes of 'SNL' and also on Amazon's "Cafe Society" alongside Steve Carell.
Actress Eliza Holland Madore, who played Ivanka in "Once" expressed her heartbreak ... "I am deeply saddened by the sudden loss of one of my Ivanka sisters. Laurel - you were always smiling and always made other people laugh,”
Madore went on ... “I’m so incredibly grateful that I got to know you. You will never be forgotten, and we will never stop loving you. Everybody in the Once Family is going to keep you alive through us. R.I.P. My heart goes to her family.”