Presley Gerber, the model son of American supermodel Cindy Crawford and businessman Rande Gerber, has died at the age of 27. 

The Los Angeles County Medical Examiner’s records show he died on Sunday at a rehabilitation facility, and his death has since been confirmed by a representative of the family.

No cause of death has been listed. The medical examiner’s office said an autopsy was scheduled for Monday and that its investigation is still ongoing. In a statement, the family’s representative asked for privacy during what was described as a very difficult and painful time.

Gerber was the older brother of model and actress Kaia Gerber. Born in California in 1999, he followed his mother into the fashion world at a young age, signing with IMG Models at 15 and making his runway debut for Moschino at 16.

He went on to walk for brands including Dolce and Gabbana, Burberry, Bottega Veneta, Tommy Hilfiger and Ralph Lauren, and also appeared in a Calvin Klein campaign.

In recent years, Gerber spoke openly about his struggles with mental health and substance abuse. Last December, he shared an Instagram video in which he discussed his use of prescription medication and the loss he had experienced. Crawford responded at the time with a public message telling him he was not alone. In July, she marked his 27th birthday with a social media post saying she was proud of the man he had become. Earlier this month, Kaia Gerber also spoke about her brother’s battle with addiction in American Vogue’s September cover story, describing how such experiences deeply affect an entire family.

Tributes have followed from within the celebrity circle. Socialite Paris Hilton said she was completely heartbroken, describing him as a sweet, sensitive and genuine soul. Brooklyn Beckham also paid tribute, calling him one of the kindest people he knew.