L'Wren Scott, Mick Jagger's Girlfriend & Fashion Designer, Found Dead of Apparent Suicide

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Sir Mick Jagger and L'Wren Scott arrive at the Harper's Bazaar Women of the Year awards at Claridge's Hotel on November 5, 2013 in London, England.

Rolling Stones frontman is "completely shocked and devastated by the news"

L'Wren Scott, a fashion designer and the longtime girlfriend of Rolling Stones frontman Mick Jagger, was found dead Monday of an apparent suicide in her Manhattan apartment, police said, according to the New York Daily News. A law enforcement official speaking on the condition of anonymity confirmed Scott's death with the Associated Press.

The official said Scott's assistant found the stylist hanging from a doorknob at around 10 a.m. Monday. No note was immediately found.

A spokesperson for Jagger told Billboard in a statement that he is "completely shocked and devastated by the news." The Rolling Stones are currently on tour in Australia and scheduled to perform in Perth on Wednesday (March 19).

Scott and Jagger have dated since 2001, and she designed the Rolling Stones frontman's costumes for the legendary band's 50th anniversary tour. "Shirts, suits, jackets — sometimes I'll see great fabrics and I'll just buy them for him and say: 'I've got these beautiful fabrics to make great little jackets or suits for you,'" she told The Hollywood Reporter last year.

The adopted daughter of an insurance worker and a local banker in Utah, Scott (born Luann Bambrough in 1967) left the U.S. at the age of 17 when photographer Bruce Weber advised the teenager to explore modeling. Scott headed straight to Paris, where she landed a booking at a Chanel couture show and started piling up modeling appearances.

In 1994, Scott moved to California to begin working with Herb Ritts as a stylist, and developed long-lasting style advisory relationships with Nicole Kidman, Sarah Jessica Parker and Christina Hendricks, among others. Her first fashion collection as a designer, 'Little Black Dress,' launched in 2006. L'Wren Scott shoes were first carried by vendors in 2009, and in 2011, Scott introduced her first collection of handbags, named 'Lula' after her mother.

"This is a horrible and tragic loss," said Madonna. "I'm so upset. I loved L'Wren's work and she was always so generous with me."

Scott canceled her London Fashion Week show last month, reportedly due to production delays.

Additional reporting by the Associated Press