Lindsay Sandiford, a British grandmother on death row in Indonesia for drug offences, said she is "deeply saddened" by the "senseless, brutal deaths" of two Australians who were among eight convicted drug smugglers executed on 28 April.
She said Myuran Sukumaran and Andrew Chan "touched the lives of a great many people" after helping to rehabilitate fellow prisoners.
And she now fears she will be the next to face the firing squad but she "just wants to get it over with".
She said: "If they kill someone as good as Andrew, what hope is there for me? I just want to get it over with. I feel like just giving up."
In a statement issued through her lawyer from Kerobokan Prison in Bali, Ms Sandiford, 58 - who was sentenced to death in January 2013 in Bali after being convicted of trafficking drugs - said: "I am deeply saddened to learn that Myuran Sukumaran and my dear friend Andrew Chan have been executed.
"Many things have been said about whether Andrew and Myuran deserved to die for their crimes.
"I didn't know those men at the time they committed those crimes 10 years ago. What I can say is that the Andrew and Myuran I knew were men who did good and touched the lives of a great many people, including myself."
Ms Sandiford, from Cheltenham in Gloucestershire, said Chan was a "close friend and confidante" when they were in Kerobokan prison together.
"He counselled and helped me through exceptionally difficult times after I was sentenced to death in 2013," she added.
"Myu and Andrew used their time in Kerobokan to make life better for everyone around them. They introduced the concept of rehabilitation to a prison that never had it before.
"They organised painting classes, cookery classes and computer classes, and gave practical help to make sure the poorest prisoners had food, clothing and essentials.
"Whoever they were and wherever they were from, they made sure inmates who were sick got access to health care and hospital services which are not covered by the prison budget.
"The men shot dead today were reformed men - good men who transformed the lives of people around them. Their senseless, brutal deaths leave the world a poorer place."