Graham Nation, a celebrated celebrity stylist known for working with A-list stars, has tragically passed away at 39 after being found unresponsive at the gym

The 39-year-old, who was born Graham Cheek, died on Feb. 14, according to the Los Angeles County Medical Examiner. A case summary released on the medical examiner’s website said he died while at a gym, though the exact cause of his death had yet to be determined as of Wednesday, Feb. 19.

Celebrity stylist Graham Nation, who passed away on Valentine's Day, worked with numerous high-profile celebrities including Demi Moore, Jared Leto, Venus Williams and Catherine O'Hara

Celebrity stylist Graham Nation, who dated Gavin & Stacey actress Sheridan Smith, has died aged 39 after collapsing in the gym on Valentine's Day

Celebrity hairstylist Graham Nation has died. He was 39. According to the LA County Department of Medical Examiner, the dad of one died at a gym in Los Angeles on Friday 14 Feb. The case is pending additional investigation.

Renowned celebrity hairstylist Graham Nation has reportedly passed away at only 39 years old. He was widely celebrated as one of the top hairstylists in Los Angeles, having built an impressive career working with a long list of A-list clients.

Courtesy of Graham Nation/Instagram Graham Nation, the celebrity hairstylist known for his work with Serena Williams, Demi Moore and Catherine O'Hara, died suddenly on Friday, February 14, at a Los Angeles gym,

Celebrity hairstylist Graham Nation has died at age 39. Nation's client list included stars like Demi Moore, Madison Beer, Alix Earle and Meghann Fahy.