After a 25 year career, Samuel Johnson — star of The Secret Life of Us and Channel 7’s Molly series — has announced he is retiring from acting to focus on cancer fundraising.

The star announced his retirement last Thursday on the Facebook page of breast cancer charity Love Your Sister.

“I think this is the best place for me to announce my retirement from acting, after nearly 25 years! And what better time to hang up my hat, so to speak! I can’t act anymore. Not if I’m to serve you properly. This village means everything to me and I’m tired of other things dragging me away from you,” he wrote.

“I cannot play pretend on telly while our families are falling. Cancer is the last true riddle of our time (not of our doing) and I wanna be part of the push to solve it once and for all – part of the new ‘moonshot’.”

In 2014, Samuel raised nearly $2 million for cancer research by cycling over 15,000 kilometres across Australia on a unicycle setting a Guinness World Record, but his newest goal is to raise $10 million.

“We raised $1.4M in our first year, $800K in our second year, and last year, down to $200K. We’re not going to get there if I’m off gallivanting. So I won’t. Not until we get to that $10M and show those faceless (expletive) at the top end of town just how serious we are about research here at ground level.”

In the post, Samuel says he loves acting but helping people is more important.

“I love acting, it’s the best job in the world. But the thing is, being a ‘vollie’ for healthy families kinda wins hands down. No contest. If it weren’t for Molly, I’d have done it sooner,” he wrote.

“So call me Molly if you like. Call me Research Australia’s Advocate of the Year. Call me that annoying voice over guy. Call me a fundraiser, an advocate, an activist. Call me a brother who tries hard. Just don’t call me an actor. Not until we as a nation are as threatened by cancer as we are by terrorism. Not until the $10M is raised. Until then, I’m all yours, around the clock.

“I’ll stop at nothing.”