Bruno Bersot's cause of death revealed after Sydney surfing legend died suddenly, leaving behind a wife and two sons

Bruno Bersot's cause of death has been revealed after the surfing legend died suddenly.

Bersot, who was living in Maroubra in Sydney's eastern suburbs, died on Tuesday, leaving behind his wife and two sons.

The beloved father-of-two was a popular figure in Sydney's surfing community and his death has been widely mourned. 

Bersot's cause of death has been revealed. He had been suffering what he thought was a minor back injury unaware he actually had a blood clot in his heart.

The blood clot travelled to his brain, causing Mr Bersot to suffer a fatal stroke, leaving his family shattered.

Tributes have poured in for the talented surfer who is understood to have been born in Brazil before moving to Australia, and honoured as a beloved 'Bra Boy' and Maroubra legend.

'We are sending love to all our Brazilian Bra Boy Family and to the Bersot Family. Bruno was My Brothers Keeper in action - devastated for you all,' a post on a page associated with the Bra Boys read.

Mr Bersot's son Lucas described him as the 'most beautiful dad' in the world in a heartbreaking post.

'He fought long and hard for everyone that he loved. I don't even know what to write about because it still doesn't seem real that someone so loved by all has passed away. I've lost the energy to cry I'm truly speechless,' he wrote.

'Dad I love you so much there won't be one single second of my life that I won't be thinking about you.

'I'm gonna miss the time we shared in the water and our everyday activities. I know you would want us to be strong and continue with our lives and it's gonna be hard but we will continue to make you proud. You will forever be in our hearts.

'I really wish today wasn't gonna be the last time I got to hug you but you will forever be by my side. I know you're gonna be up in the heavens surfing the best waves having the best time with your mum and dad. Heaven gained a beautiful angel today.'

Mr Bersot's other son Mateus said he'd lost his 'superhero'.

'No words explain how I feel and how much I miss you,' he wrote, alongside a series of family photos.

'You are my best friend and I can't thank you enough for teaching me everything I know in the surf and outside of the surf. I'll love you forever.'