Bali 9 ringleader Andrew Chan was put to death by firing squad on Tuesday in Indonesia after serving 10 years on death row.
Convicted of attempting to smuggle drugs, the Australian national wrote a stark warning letter to school children in his home country.
In it, he speaks about how he first got involved with drugs and organised crime and warns youngsters not to make the same mistakes that he did.
The letter reads: “Now the reason why I'm writing you this letter is to address you guys about the dangers of drugs and the effects it can have on you and also others.
“To tell you a little bit about my life story, I was once 15, 16 and it wasn't too long ago I was sitting in a class just like you guys.
“I was an average kid and let me tell you that my teachers didn't like me one bit and I was no teacher's pet.
“But to cut a long story short, I got mixed up with drugs at a pretty young age and by the time I was 15 I was merged into the scene.”
He continued, adding: “My life is a perfect example of an absolute waste.
“Now to elaborate the effects of where I am, I've missed weddings, I've missed funerals and the simple presence of my own family.
"The hurt and pain - I don't just put it onto myself, but the pain I put on my family is agonising.
“A simple touch such as a hug is not possible for a condemned man like me. I have nothing but an iron bar to hug rather than to be embraced by those I love and who I miss.”
The letter has been seen by school children across Australia in an effort to prevent teenagers from getting involved in organised crime.