Three German nationals arrested for the murder of a 62-year-old German businessman whose dismembered body was found in a freezer at a house in Pattaya have denied all charges.

The fourth suspect, Mr Uddin, a Pakistani with Thai nationality, was arrested in Kanchanaburi on Wednesday afternoon while trying to flee across the border to Myanmar, police said.

The three suspects were Ms Petra Christl Grundgreif, 54; Olaf Thorsten Brinkmann, 52; and Ms Nicole Frevel, 52. All were German citizens and all denied any involvement.

Ms Frevel, a disabled woman, rented the house where the body of Hans Peter Mack was found in a freezer on Monday. He had been missing since July 4.

Police said Ms Grundgreif suffered chest pains while being held in a police station cell. She was treated by medics.

Ms Frevel was also treated, for a knife wound. She had cut her wrist.

Ms Grundgreif, Mr Brinkmann and Mr Uddin are suspected of using an electric saw to cut Mack’s body into 13 parts, which were put into three plastic bags. The bags were put in the freezer.

Surveillance camera footage showed Mack had met Ms Grundgreif in a café in Bang Lamung district on July 4. They later drove to a pool villa in Soi Chaiyaphreuk 1, where Mack was believed to have been murdered.

Investigators believe the other suspects were waiting for Mack at the villa and forced him to transfer money into their bank accounts before killing him and cutting up his body.

According to Mack’s 24-year-old Thai wife, he left their house in Pattaya on July 4 to meet a foreign property broker. That was the last time she saw him.

Five days later, Mack’s silver Mercedes-Benz was found.