Cindy Clark

USA TODAY

Fashion designer L'Wren Scott and longtime girlfriend of Mick Jagger has been found dead of an apparent suicide, reports the AP, ABC News and the New York Daily News .

Scott's body was found hanging from a scarf on a doorknob by her assistant at the designer's New York residence around 10 a.m. Monday, reports the Daily News. The AP reports an official as saying no note was found and there was no sign of foul play. The medical examiner's office will determine the cause of death. Scott was believed to be 49 but had not disclosed her precise age, according to the AP.

Fran Curtis, a spokesperson for Jagger, tells USA TODAY that the singer is "completely shocked and devastated by the news." Scott had been in a relationship with the Rolling Stones frontman for more than a decade. Jagger is currently on tour with his band and recently arrived in Australia.

Scott, who began her career as a model, was an established designer who launched her eponymous label in 2006. Scott's designs were worn by A-listers including Nicole Kidman, Sarah Jessica Parker, Angelina Jolie, Penelope Cruz, Amy Adams, Madonna and Michelle Obama. In 2012, Jagger visited the White House where he was delighted to see the first lady wearing his girlfriend's designs. "It was so great to see the first lady wearing L'Wren Scott clothes when we were at the White House the other day," he proudly pointed out during an interview at the time with USA TODAY. "So that was really good. And I didn't see much of Fashion Week because I only came up for the last day. I'm not really that much of a Fashion Week groupie, but I went to L'Wren's show and that was great."

In December, a special limited edition collection of L'Wren Scott designs for Banana Republic made her style more attainable for the masses and quickly sold out. The company has tweeted that they are "stunned and saddened to learn of the loss of L'Wren Scott. Our hearts and prayers go out to her friends and family."

Other retailers and notables throughout the fashion world, as well as celebrities, took to Twitter to express their condolences.

Marc Jacobs: "Rest in peace, L'Wren Scott. You'll forever be missed."

Cushnie et Ochs: "RIP L'wren Scott, so sad to lose a beautiful strong female designer."

Bette Midler: "Just got news of the beautiful L'wren Scott's death perhaps by her own hand. I am devastated. A rare, wonderful, talented soul. Goodbye."

Olivia Munn: "Shocked and saddened by the passing of @lwrenscott ... she was an amazing soul, talented artist and an unbelievably giving friend. RIP."

Bo Derek: "RIP L'Wren Scott and thank you for making me feel beautiful. @lwrenscott #L'WrenScott"

Jaimie Alexander: "This is extremely sad news. RIP L'Wren Scott. You were most certainly one of a kind."

Nina Garcia: "Saddened over the loss of the very talented, generous and always gracious L'Wren Scott. You will be missed"

Neiman Marcus: "It is with great sadness that we've learned about the tragic loss of designer L'Wren Scott. #RIP"

Gilt.com: "Deeply saddened to hear about the passing of L'Wren Scott—a brilliant fashion mind and a beautiful woman. Our thoughts are with Mick."