Adam Selwood was aiming to raise $10k for mental health charity after brother Troy's tragic passing

NOTE: This story was first published in April, and has been updated after Adam Selwood's death on May 17.

After Troy Selwood's death in February, his twin brother Adam committed to running a half-marathon for a special cause.

Troy tragically died by suicide in February at the age of 40, sending shockwaves around the AFL community.

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Selwood told 9News Perth running was a significant part of the bond the two brothers shared, and announced he would take part in the HBF Run For A Reason, with a fundraising goal of $10,000 to support zero2hero, a charity that intends to empower younger people to support and maintain their own mental health and prevent suicide.

"We loved running together growing up, it was one part of us to become football players, we knew that going out to do cross country runs together," he said.

"We actually joined a club in our teenage years, they were some of our real happy memories."

He was supposed to be among nearly 40,000 West Aussies to take part in the event next Sunday.

Tragically, Adam died in non-suspicious circumstances on Saturday morning.

In April, the then-40-year-old described the call from his brother, Joel, about Troy's death as the "worst phone call that you could ever imagine".

"We were asleep over here in Perth so to know Joel was calling at that time in the morning, you knew something was wrong," he told 9News Perth.

"You always had a bit of a worry that the day could occur ... I was so lucky to be a twin and to have a twin brother I was able to share on this earth for 40 years."

Reflecting on his brother's passing, Adam believes Troy has "already saved lives".

"I don't want anyone to go through this type of pain if it can be avoided, and it can," he said.

"He's already saved lives, many, that probably during that period needed to speak up and get the care required, to know that's occurred does warm my heart and does provide me with the strength to keep moving through."

Readers seeking support can contact Lifeline on 13 11 14 or beyond blue on 1300 22 4636.