British Olympic cyclist Katie Archibald said she tried desperately to save her partner Rab Wardell as he suffered a fatal cardiac arrest in bed beside her.
The champion cyclist expressed her devastation after Wardell, a mountain biker, died aged 37 on Tuesda.
His death came two days after he won the Scottish MTB XC Championships in Dumfries and Galloway.
Archibald, 28, made an emotional statement in a social media post on Wednesday morning.
She tweeted: "I think you've heard that Rab died yesterday morning.
"I still don't understand what's happened; if this is real; why he'd be taken now - so healthy and happy.
"He went into cardiac arrest while we were lying in bed. I tried and tried, and the paramedics arrived within minutes, but his heart stopped and they couldn't bring him back."
Archibald, who won track cycling gold medals at Tokyo 2020 and Rio 2016, added: "Mine stopped with it. I love him so much and need him here with me. I need him here so badly, but he's gone. I can't describe this pain."
The four-time world champion went on to thank everyone who had paid tribute to Wardell.
I think you've heard that Rab died yesterday morning.
— Katie Archibald (@_katiearchibald) August 24, 2022
I still don't understand what's happened; if this is real; why he'd be taken now - so healthy and happy.
He went into cardiac arrest while we were lying in bed. I tried and tried, and the paramedics... /1
Those who have sent messages of support include Olympic gold medallists Sir Chris Hoy, Dame Laura Kenny and Lizzy Yarnold.
Archibald's Twitter thread ended with: "I can't bear to talk about him in the past tense to say anything myself. You mean everything to me, Rab. I love you."
Wardell, a former Commonwealth Games cyclist, appeared on BBC Scotland's The Nine programme on Monday, just hours before his death.
He described how he won the title at Kirroughtree Forest on Sunday despite enduring three punctures.
The mountain biker, who lived in Glasgow, had been racing since he was a teenager but only turned professional earlier this year.
His weekend win was described as a "show of incredible resilience" by British Cycling.
Recalling the race the day after on The Nine, Wardell said: "To be honest, it was a bit of a disaster, but I just have to keep on trucking and keep racing.
"I guess I still felt confident that I'd be able to catch the leaders and win so I just gave it my best shot - what more can you do?"
Scottish Cycling said it was "devastated" to confirm the death of its former employee, who set a new record time for completing the West Highland Way in 2020.
"We have very little information at this stage, but we send our love and support to his family, friends and all those in our community who knew him," the organisation posted on Twitter.
Seven-time Olympic champion Hoy posted: "Can't believe this. Utterly heartbreaking.
"Rest in peace Rab."
Kenny, a five-time Olympic gold medallist, replied to Archibald: "Thinking of you this morning."
And Yarnold, Britain's most successful Winter Olympian, wrote: "All my love Katie, what an awful time. I'm sorry xx"
Cycling website pedalnorth.com also paid tribute to a "quiet yet talented friend".
Cyclist and close friend Rob Friel said he was "numb with shock" after hearing the news of Wardell's death.
"Rab had a contagious energy in everything he did and was a really well-liked figure in Scottish cycling," Mr Friel said.
"Rab always wanted to ride, but he was an amazing coach too. He could coach an elite rider or he could coach a beginner or a child.
"Whatever the discipline or whatever the level, he could tune in to you."
We’d like to take a moment to remember @RabWardell our friend. Unfortunately Rab left the world last night, quietly and tragically in his sleep.
— pedalnorth.com (@pedalnorth) August 23, 2022
Last weekend Rab won @ScottishCycling National XC championship, was so proud, as we were.Rab, our quiet yet talented friend RIP pic.twitter.com/WHJsx1tf2Z
Mr Friel told BBC Scotland that Wardell had also been one of the most versatile cyclists he knew.
"He raced at the top level in road, mountain bike and enduro - but he also learned how to do a back flip on the bike. Not many people can do all that," he said.
-BBC
