Simon Peter Carman, a 45-year-old Australian truck driver, has broken his silence from a Thai jail, asserting his innocence in the death of 17-year-old Tunchanok Donhomla. Carman faces potential execution in Thailand for charges including murder, concealing a body, and taking a minor for sexual purposes.

Donhomla's body was discovered in a black suitcase near railway tracks on the outskirts of Pattaya on June 27. She was last seen on CCTV with Carman in his condo building's foyer two days prior. Carman was apprehended at Bangkok's Suvarnabhumi International Airport shortly before he was to board a flight back to Perth.

From Pattaya Remand Prison, Carman told ABC's Foreign Correspondent that the incident was "unavoidable" and that he acted in self-defense. He alleged that Donhomla attacked him with a knife during an argument over money, stating, "All of was trying to do is restrain her from stabbing me." He claimed that she continued to struggle violently even after he had her subdued.

Carman expressed remorse for Donhomla's family and stated he was unaware she was a minor, adding that she followed him to his accommodation. "I honestly do not know why she followed me home," he said.

He is determined to fight the charges and hopes for release, potentially on bail, asserting, "I have done nothing wrong. I shouldn't be here… I do not understand what's going on." Carman also indicated he has not yet secured a lawyer and has only received visits from representatives of the Australian embassy.

According to an autopsy report, Tunchanok "had a brain injury and she suffocated." Colonel Anek Srathongyoo of Pattaya City Police stated there were no other injuries and that Carman's DNA was matched to DNA found on the victim. Prosecutors have until September 18 to indict Carman.

Donhomla had traveled from her home in northern Thailand to Pattaya for a holiday. She had met Carman on Jomtien Beach and given friends his address. A friend reported her missing to police the day after she was last seen and later confronted Carman at his condo. By that time, police allege, Carman had already suffocated Donhomla and disposed of her body.

A murder conviction in Thailand can carry the death penalty or a prison sentence of 15 to 20 years.