Matt, 29, a professional chef from the Lake District, collapsed at the 22.5 mile mark of the London Marathon.
The talented chef had run in tribute to his beloved dad Martin, who passed away suddenly 18 months ago.
Matt, who reached the semi-final of Masterchef last year, had also run the Manchester Marathon for the same charity, Brathay Events, and set a personal best time just a fortnight ago.
But despite completing the northern event without any problems, the runner fell to the ground yesterday afternoon.
He received immediate medical treatment on the scene from race doctors but died later in hospital.
Matt was no stranger to long-distance running and had completed the Marathon de Provence in the South of France in October last year.
In a heartfelt Instagram post he described how running had helped him cope with the loss of his dad.
He wrote: “I really wanted to run a marathon where I knew nobody, had no personal time goals and was able to spend the whole time really thinking about my dad.
“This was the best run of my life. I listened to Duran Duran & Belinda Carlisle most of the course, relived so many memories and really felt like he was there messing around & laughing with me.”
On a JustGiving page set up to raise money for his London Marathon effort, Matt revealed it was his dad that inspired him to take up running.
He said: "He was the most inspirational man in my life and was the one who said – 'Go on, why don't you give it a go? I know you can do it!' and entered me into my first marathon; Brathay 2016 along with my brother, Josh.
"It was maybe the proudest day of my life standing at the finish line having achieved something I never imagined possible with my Dad & my Brother by my side."
Matt's website says he began his career working in Michelin-starred kitchens after finishing second on BBC Young Chef Of The Year at the age of 20 in 2009.
Speaking about running the London Marathon, he wrote on Instagram in February: "Words can't describe how honoured and humbled I feel to be asked to run this year's @londonmarathon on behalf of @brathaychallenges/@brathaytrust and in memory of my Father, Martin Campbell.
"It's been almost 18 months since I lost my Dad and this has been the most challenging period of my life."
Following the announcement of Matt's tragic death his London Marathon fundraising page was flooded with donations – surpassing his target of £2,500.
His former tutor, Nick Martin, tweeted: "I’m absolutely gutted, just got the news that Matt Campbell sadly died after the London marathon.
"What a lovely, kind hearted and genuine young man who had a massive future in front of him.
"I’m so glad and honoured to have known him as one of my students but mainly as a friend."
Ahead of the race runners were warned over the record-breaking hot temperatures.
Since the London Marathon began in 1981, 11 other runners have died.
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