Scott's body was found hanging from a scarf on a doorknob by her assistant at her New York apartment around 10 a.m. today, reports the Daily News. The medical examiner's office will determine the cause of death.
A spokesman for Jagger said the singer was "completely shocked and devastated" by Scott's death. 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.
Marc Jacobs has tweeted a tribute to his fellow designer: "Rest in peace, L'Wren Scott. You'll forever be missed."