USA Cycling confirmed Catlin, a three-time world champion and Olympic silver medallist, has died
And her brother posted an emotional message on Instagram saying she committed suicide.
“My sister Kelly committed suicide last night,” he wrote on Facebook.
“She’s the one person I had shared almost my entire life with, and I shall miss her terribly.”
Her sister Christine claimed she wasn’t the same after suffering a concussion and tried to take her own life back in January.
“[She] was a really special person – kind, funny, empathetic, and talented at literally everything she did,” Christine told The Washington Post.
“She just felt like she couldn’t say no to everything that was asked of her and this was her only escape.
“She had suffered a concussion a few months ago and had not been the same mentally ever since.”
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Her father said the ‘hurt was unbelievable’.
“There isn’t a minute that goes by that we don’t think of her and think of the wonderful life she could have lived,” he told VeloNews.
“There isn’t a second in which we wouldn’t freely give our lives in exchange for hers. The hurt is unbelievable.”
Catlin won individual pursuit bronze at the 2017 and 2018 championships.
“We are deeply saddened by Kelly’s passing,” said USA Cycling president and chief executive Rob DeMartini.
“We will all miss her dearly. Kelly was more than an athlete to us and she will always be part of the USA Cycling family.
“Our thoughts and prayers are with the Catlin family. This is an incredibly difficult time and we want to respect their privacy.
“The entire cycling community is mourning this immense loss. We are offering continuous support to Kelly’s team-mates, coaches and staff. We also encourage all those who knew Kelly to support each other through the grieving.”
Catlin was studying computational and mathematical engineering at Stanford University in California after graduating from the University of Minnesota last year with degrees in mathematics and Chinese.
“The news of Kelly’s passing has hit the team hard,” said Rally UHC Cycling in a statement on social media.
“Losing an incredible person at such a young age is very difficult.
“Kelly was our friend and team-mate. Our heartfelt condolences go out to her family and those who were fortunate enough to know her best.”
For confidential support call the Samaritans in the UK on 116 123 or visit a local Samaritans branch.