The bizarre message an Australian expat accused of murdering a Thai teenager sent to the dead girl’s parents appeared to be ‘self-serving’, according to a leading forensic psychologist.  

Simon Peter Carman, 45, allegedly killed 17-year-old Tunchanok Donhomla before putting her naked body into a suitcase and dumping her remains near train tracks, then attempting to fly home to Perth. 

Carman, who has been described as ‘a bit abnormal’, has been charged with murder, while Ms Donhomla’s devastated parents have demanded the accused killer be executed. 

Ms Donhomla and Carman are understood to have met on Beach Road at Pattaya, an area notorious for street prostitution known locally as ‘Coconut Bar’, early on Thursday morning.

The pair allegedly went back to Carman’s condominium where an argument allegedly broke out when he reneged on an agreed 1,000 baht (AU$43.45) payment and offered Ms Donhomla 500 baht (AU$21.72).

Police have released a taped interview in which Carman addressed Ms Donhomla’s family by saying: ‘I feel bad for what happened to your daughter.’

‘It was out of my control. I know you’ll be very sad, upset, same, same me. It shouldn’t happen, and I hope you’re OK. I know you’re not, but I hope, and please tell other girls…to be careful.’

Forensic psychologist Tim Watson-Munro described what Carman told police as ‘the words of a simpleton at its highest; an insightless, gormless psychopath at its lowest’.

The bizarre message Australian expat Simon Carman sent to the parents of Thai teenager he is accused of murdering appeared to be ‘self-serving’, according to a leading forensic psychologist. Carman is pictured in custody

 Carman, 45, allegedly killed 17-year-old Tunchanok Donhomla (above) before putting her naked body into a suitcase and dumping her remains near train tracks then attempting to fly home to Perth

‘Anyone who’s [allegedly] killed someone saying that – “I feel bad and I hope everyone’s all right” – it’s like, “Can we go back to the footy”,’ Mr Watson-Munro told Daily Mail.

Mr Watson-Munro added that Carman’s warning – ‘Please tell other girls to be careful’ – was ‘kind of self-serving, isn’t it?’

‘I would have thought, as a psychologist looking behind what he said – “Please be careful” – why? “Because blokes like me are out and about”? 

‘It’s almost a kind of consciousness of guilt statement without declaring it.’

There have been reports Carman had a brain tumour, which was part of the reason he was living in Thailand.

‘I understand he was working there some of the time, and the locals viewed him as a bit of a simple Simon,’ Mr Watson-Munro said. ‘I think that was the quote I read, a simple bloke. 

‘I also read that he might have had a brain tumour. I don’t know if that’s been corroborated or verified. 

‘But if he has brain damage, I guess that’ll come out with the effluxion of time. One would imagine he’ll be appropriately assessed over there, but to tell everyone to be careful…’

CCTV allegedly shows Carman wheeling a black suitcase from his hotel before strapping it to a motorbike and driving away 

Police allege Ms Donhomla’s naked body was crammed into a suitcase and dumped near railway tracks (above) just ten minutes away from Carman’s condominium 

Carman, who is being held in Pattaya Prison, has denied murdering Ms Donhomla and allegedly told police he acted in self-defence after she attacked him with a knife.

‘The story that she pulled a knife on him, I would have thought is a bit far-fetched,’ Mr Watson-Munro said. 

‘You’ve got a bloke who’s picked up a 17-year-old alleged street worker, taken her back to his place, they’ve argued over 20 bucks or something.

‘It’s all about the money, honey. They don’t want to kill people. I would be very surprised, subject to what evidence is produced, that she produced a knife.’

Police allege Ms Donhomla’s naked body was crammed into a suitcase and dumped near railway tracks just ten minutes away from Carman’s condominium.

CCTV allegedly shows Carman wheeling a black suitcase from his hotel before strapping it to a motorbike and driving away.

A missing persons report was made by a friend of Ms Donhomla, and Carman was arrested at Bangkok’s Suvarnabhumi Airport just minutes before he was due to board a flight to Perth.

Police later located the suitcase in long grass, with Ms Donhomla’s belongings, including her white Onitsuka trainers, jeans, underwear, a mobile phone case, a wallet, her gold bracelet and necklace.

Forensic psychologist Tim Watson-Munro (above) described what Carman told police as ‘the words of a simpleton at its highest; an insightless, gormless psychopath at its lowest’

‘I saw the footage of the suitcase,’ Mr Watson-Munro said. 

‘I mean, what a terrible way to deal with a cadaver. And then trying to get on a plane.  I would imagine subject to what the charges are that he would anticipate the full wrath of Thai law, which isn’t pretty at its highest.’

Carman denied killing Ms Donhomla in a recorded interview with a Thai police officer.

He was also asked about visible scratches and bruises on his neck and arms.

On camera, Carman said the marks were due to ‘the spiders’, which he said were ‘always’ coming out at the condominium where he stayed.

Carman has been charged with murder, concealing a body, moving a body and offences relating to a minor. In Thailand, a murder conviction can carry the death penalty.

The last person executed in the country was Theerasak Longji, 26, who died by lethal injection at Bang Kwang Central Prison after being convicted over the aggravated robbery and fatal stabbing of a 17-year-old boy. 

Carman had been living for eight months in the Rimhad Jomtien Condominium complex, where he worked as a handyman and kept a low profile.

Ms Donhomla’s father Thongchai Donhomla and stepmother Oradee Bussarakum (above) made the journey to Pattaya to collect their daughter’s remains 

Neighbours said he spent most of his time at the ground-floor bar or doing small jobs around the complex.

A woman who spoke with the former truckie almost daily said he appeared ‘a bit abnormal’.

‘He speaks slowly and looks at things for a long time,’ the woman told The Australian.

Ms Donhomla’s father Thongchai Donhomla and stepmother Oradee Bussarakum made the journey to Pattaya to collect their daughter’s remains from their home in the northeast Thailand province of Kalasin.

They told local media Ms Donhomla had only arrived in Pattaya days before her death.

It was her first visit to the city infamous for its wild nightlife, but her parents had let her go with a friend because she was ‘helpful’ and never had any issues with drugs.

Ms Donhomla’s father said he is ‘deeply saddened’.

‘My daughter had no mother so whenever she wanted anything she would find a way herself, and she always helped me too,’ Mr Donhomla told reporters.

Ms Bussarakum said: ‘I told the police I want him executed. As a stepmother I don’t know what else to say. I just want him executed.’