The young man was taken to Pratunam Chulalongkorn police station on Monday afternoon for questioning after forensic investigations concluded that the gunshot wound to the 16-year-old alleged gunman was not reconcilable with the position of the pistol found at the crime scene.
The parents, aged 41 and 44 years old, and their younger son were found dead in a bedroom at their house in Pathum Thani's Thanyaburi district on Sunday. The older son told police he arrived home Sunday afternoon and knocked on his parents’ bedroom but there was no answer.
He said he broke open the door and found the bodies of his parents and his brother inside and told police that his brother could have been under pressure after being reprimanded for having poor exam grades and being addicted to playing games on his smart phone.
Pratunam Chulalongkorn police chief Trakul Kiewprasert told reporters that police were investigating further and had not yet concluded that the younger boy was the killer as claimed by his brother.
The policeman, who questioned the teen for about an hour, said forensic officers found that all three victims were shot in the left side of the head, while the pistol was dropped near the right hand of the 16-year-old.
The position of the gun led to the assumption that he was right-handed, so it would have been unusual for him to shoot himself in the left side of the head, Pol Col Trakul said.
The older boy’s initial testimony about the surveillance camera system at the house also contradicted what investigators discovered later, he added.
Police escorted the 19-year-old to the house where they examined his car and took some of his clothes for examination, before accompanying the student to his condominium in Bangkok on Monday evening, to collect more evidence.
The young man insisted that his brother committed the crime and denied any involvement in the killing.