The ‘Medical Surgery’ Lie: The Sinister Cover Story Behind the Deadly Trip to Thailand
Chilling Final Texts and Grisly Confession Emerge in Thai Suitcase Murder
PATTAYA, THAILAND — The self-defense alibi of an Australian man accused of murdering a 17-year-old Thai girl has spectacular crumbled, as investigators release harrowing new details about the victim’s final hours and the suspect’s deeply troubling past in Western Australia.
Simon Peter Carman, 45, remains in a Thai holding cell following his dramatic arrest at Bangkok’s Suvarnabhumi Airport. He was intercepted by immigration officers just minutes before he could board a Jetstar flight back to Perth, leaving behind a horrifying crime scene in the resort city of Pattaya.
For days, Carman maintained that the death of 17-year-old Tunchanok “Cake” Donhomla—whose naked body was found dumped in a black suitcase near railway tracks—was an accident. He initially told police that the teenager had pulled a kitchen knife on him during a dispute over 500 baht (approximately $20 AUD), resulting in a fatal struggle.
However, newly uncovered digital evidence and a grueling police interrogation have painted a far more sinister picture.
The Haunting Final Message
According to Thai authorities, the narrative of a sudden, unexpected altercation contradicts the digital timeline left behind by the young victim.
Hours before she was killed, the 17-year-old messaged her friends via the popular LINE application. Far from expressing fear or distress, her final message was hauntingly reassuring. She explicitly told her friends that she was “safe” and had decided to stay at Carman’s hotel room.
That message would be her last.
From “Spider Bites” to a Brutal Confession
Carman’s initial attempts to cover his tracks unraveled quickly under the scrutiny of Thai detectives. When asked about the deep scratch marks on his neck and arms—which police immediately identified as defensive wounds from a victim fighting for her life—Carman bizarrely claimed they were “spider bites.”
Under intense questioning, the facade finally broke. Thai Police Colonel Anek Srathongyoo revealed that Carman ultimately confessed to a horrific sequence of events.
The 45-year-old admitted to strangling the teenager during an argument inside his hotel room until she lay motionless. According to the police report, Carman then dragged her lifeless body into the bathroom. Claiming he was “clueless to find a solution” on what to do with the remains, he made the gruesome decision to stuff her into a large black suitcase, strap it to a rented motorbike, and abandon it in a grassy, secluded area.
A ‘Seedy’ Past and Revoked Gun Licenses in Australia
As the international manhunt gives way to a complex legal proceeding, Australian media has uncovered deeply unsettling details about Carman’s life before he arrived in Thailand.
Former neighbors from Perth’s southern suburbs, where Carman lived a transient life moving between towns like Jerramungup, Albany, Rockingham, and Casuarina, have described his behavior as erratic and confrontational. Locals branded his lifestyle as “seedy,” noting he frequently engaged in loud disputes and maintained bizarre nocturnal routines, often sleeping straight through the day.
Most alarmingly, acquaintances reported that Carman regularly bragged about owning firearms. It has since been confirmed by authorities that Western Australian Police had officially revoked and suspended his firearms license approximately a year before he relocated to Thailand.
Digital Vitriol and the “Medical” Lie
The darkness of Carman’s real-world interactions was mirrored online. A dive into his digital footprint revealed a highly volatile internet persona. Months of social media activity exposed a trail of erratic, offensive, and “vile” messages, including aggressive and derogatory comments directed at others.
Investigators also learned that his trip to Pattaya was built on a lie. Before leaving Perth, Carman reportedly told acquaintances that he was traveling to Thailand for “medical surgery”—a fabricated cover story that now appears to have been a smokescreen for his true activities abroad.
Justice Across Borders
The brutal death of Tunchanok Donhomla has sparked outrage in Thailand and shockwaves across Western Australia, casting a renewed and critical spotlight on the vulnerability of young locals to foreign exploitation.
Simon Peter Carman now faces severe charges under the Thai criminal code, including premeditated murder, concealing a corpse, and the abduction of a minor. Despite his confession to police regarding the strangulation, he formally maintains a plea of not guilty in court, continuing to argue the death was a tragic accident.
If convicted, the former Perth mechanic faces a minimum of 15 to 20 years behind bars, or potentially the death penalty. Australia’s Department of Foreign Affairs and Trade (DFAT) continues to provide standard consular assistance as he awaits his fate in a foreign justice system.
Simon Carman seen on TV with a suitcase strapped to his scooter. Credit: The Pattaya News/The Pattaya News
However, in a gruesome revelation, this is not the first time a woman has been found dead in a suitcase in Pattaya.
PerthNow does not suggest Mr Carman has any connection with the two other bodies or that any allegation to that effect has been made.
In September last year, a half-naked woman — who officers have still not been able to identify — was found dead and bound inside a suitcase floating in a reservoir.
Police officers with a suitcase that contained a body. Credit: Unknown/X
The suitcase was reportedly secured with heavy chains, padlocks and cable ties when a member of Thailand’s national rowing team spotted it while training nearby.
Police believe the woman is a foreigner in her early 30s who died from asphyxiation.
The tragic discovery came just six months after another eerily similar find.
Weights seen in the suitcase. Credit: Unknown/X
In February 2025, a local fisherman’s line became hooked on a suitcase floating in Ban Chang — just a 43 minute drive from Pattaya city.
When police officers arrived to inspect the contents of the suitcase, they found the naked body of a woman.
The suitcase had been weighed down with dumbbells, like the Pattaya murder.
This woman has also not yet been identified.
