The 33-year-old died suddenly in a medical incident at his Warrnambool home on Friday, leaving behind his wife and soulmate of 12 years, Emma, and their children Levi, Mason and Sienna.

Tristan grew up in the Ballarat region, going to Clunes Primary School before attending high school at St Patrick's College.

His family is well-known in Ballarat lawn bowls circles, particularly at their club Webbcona.

The tragedy comes just five years after the couple's son Jaxon, 2, drowned in the Merri River near Wollaston Bridge.

Now the Ballarat and Warrnambool communities are rallying to support the grieving family.

A GoFundMe campaign exceeded its goal of $20,000 within the first 24 hours of being online.

"No words will adequately describe just how tragic it is to lose Tristan as Emma and Tristan lost their little boy Jaxon aged 2.5 years old in January 2016," the campaign said.

"Tristan, rest in peace dear friend. We love you so much and will miss you everyday, you are now reunited with your little boy Jaxon in heaven."

St Patrick's College has issued a statement encouraging community support for the campaign.

"St Patrick's College is devastated to learn of the tragic passing of Tristan and we extend our deepest condolences to Tristan's wife Emma, their three lovely children and to all his family and friends," the statement read.

"Through our SPC Care program, we will reach out directly to the McArthur family to offer any assistance we can to help them in this most challenging time and we will encourage all in the wider St Patrick's College community to support the family through their GoFundMe page."

Tristan was a community man who was heavily involved in the Warrnambool Bowls Club, competing in two first-division grand finals as well as a state title.

Warrnambool Bowls Club chairman Barry Crimmin said the bowling community was devastated.

"Tristan was a member for seven or eight years before stepping away a bit more recently to start a new business and welcome a new child, Sienna," he said.

"He was so overwhelmed to have a little girl and anyone who knew him, knew that he loved his family so much. Tristan was dedicated to his partner and his kids."

Mr Crimmin said Tristan was a talented lawn bowler.

"Not many people can say they competed in a state title, especially in the country," he said.

He said Tristan was a younger member of the club who always lived life to the full.

"He was only 33 and he was the life of the party," Mr Crimmin said.

"The bowling club, and not just our club but the bowling fraternity around the place, are all thinking of the family and I'm sure everyone's hearts go out to Emma who has lived through a terrible few years.

"We as a club will do anything we can for them in this tragic time."

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Mr Crimmin said the GoFundMe campaign would help the family financially during a difficult time.

"Money isn't everything but it will definitely help out a young family," he said.

"You don't think of wills or life insurance or anything like that when you're 33. It's a tragic, tragic time."

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