Josh survived two battles with the cancer and - despite now living life managing a new illness - has gone on to hike to Mt Everest Base Camp and also make his own skydiving leaps.
Another friend of Komen's called Mike Gunter was also diagnosed with cancer aged 21.
In both cases, CanTeen supported the young men and their families.
"They were there to support my brother through his journey because he was very stressed at one point and they helped him find a counsellor," Komen said.
"They also helped Mikey and even me with a lot of support, so I thought it was time to give back to them."
Luckily for Komen, the shave was completed without a nick to his scalp or hair put out of place, as his moptop was shed in just 45 seconds and cast to the wind.
The stunt had raised $2200 as of last night.
• To donate to the CanTeen fundraiser, visit Komen's Givealittle page here.