The arrested person was identified as Simon Peter Carman.

He was arrested at Bangkok's Suvarnabhumi Airport in connection with the death of the minor when he was 'preparing to flee the country', police said.

He has denied the charges.

Pattaya City Police said in a Facebook post that the incident came to light on June 26 after Teerapat (19) filed a report with Pol. Lt. Col. Kanoknan Suksri, an investigator at Pattaya City Police Station (Dongtan).

"He reported that Ms. Thanyachanok (17) had gone missing after walking off with a foreign man late at night on June 25," police said.

Police said its forces reviewed CCTV footage that allegedly showed Carman entering a condominium with Donholma at 03:34 on Thursday.

Police said he was later seen dragging a large suitcase into the darkness.

"The clarity of the footage revealed the path he took toward the railway-side road and the exact spot where he had dumped the suitcase!" police said.

The police later found the suitcase the suspect had discarded, and upon opening it, the naked body of Thanyachanok was found stuffed inside.

Carman denied murder and further charges related to moving or concealing a body and taking a minor for sexual purposes, and claimed he had acted in self defence, reported BBC.

The man accused in the death of a 17-year-old girl in Pattaya has claimed he acted in self-defence during a confrontation that began over a 500-baht payment dispute, while police stress that his account has not yet been accepted as fact, reported Thailand's The Nation.