STANFORD (CBS SF / CNN) — Olympic cyclist Kelly Catlin, a graduate student at Stanford University, died late last week, USA cycling confirmed Sunday. She was 23.

Catlin’s brother, Colin, said on Facebook Friday that his sister killed herself.

“She’s the one person I had shared almost my. entire life with, and I shall miss her terribly,” he wrote in the post.

Catlin, a current USA Cycling national team member, won the silver medal in women’s team pursuit at the 2016 Olympic Games in Rio de Janeiro, Brazil.

Kelly Catlin competes in the women's individual pursuit bronze medal race during the UCI Track Cycling World Championships in Apeldoorn on March 3, 2018. (EMMANUEL DUNAND/AFP/Getty Images)

Kelly Catlin competes in the women’s individual pursuit bronze medal race during the UCI Track Cycling World Championships in Apeldoorn on March 3, 2018. (EMMANUEL DUNAND/AFP/Getty Images)

“Kelly was more than an athlete to us, and she will always be part of the USA Cycling family,” Rob DeMartini, USA Cycling president and CEO, said in a statement. “The entire cycling community is mourning this immense loss. We are offering continuous support to Kelly’s teammates, coaches and staff.”

Catlin was a student and an athlete

Catlin was a native of Minnesota, according to the USA Cycling website, and was an alumna of the University of Minnesota.

At Stanford, she was studying computational mathematics, according to a February guest article she wrote for the cycling magazine Velo News where she described her struggles in juggling her academic and athletic career.

“Being a graduate student, track cyclist, and professional road cyclist can instead feel like I need to time-travel to get everything done. And things still slip through the cracks,” she wrote. “It’s like juggling with knives, but I really am dropping a lot of them. It’s just that most of them hit the floor and not me.”

Athletes and cycling teams react to Catlin’s death

Professional cycling team Rally UHC Cycling wrote on their official Twitter that Catlin’s death “hit the team hard.”

“Losing an incredible person at such a young age is very difficult. Kelly was our friend and teammate. Our heartfelt condolences go out to her family and those who were fortunate enough to know her best,” the team said.

Retired professional cyclist Michael Sayers said her death was a “monumental loss for the cycling community here in the USA.”

Katie Uhlaender, American skeleton racer, tweeted “thoughts and prayers for her and her family #WEIGHTOFGOLD Three-time world track cycling champion Kelly Catlin passes away aged 23.”

How to get help: In the US, call the National Suicide Prevention Lifeline at 1-800-273-8255. The International Association for Suicide Prevention and Befrienders Worldwide also can provide contact information for crisis centers around the world.

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