Pol Col Charoen Srisasalak, deputy chief of Metropolitan Police Division 2, said Polprom Watcharasiriana, 40, was taken into police custody at the Oasis Sauna Hotel in Soi Pracharatbanpen 13 in Suthisarn area on Monday night. Police learned of his whereabouts from residents who found his car in front of the hotel.
Mr Polprom was taken to Suthisarn police station along with his two daughers, aged 7 and 5, for questioning.
His wife, Pisutthini Watcharasirinan, 40, who was seven-months pregnant was found dead with stab wounds in her room at Ratchada Suite Apartment in Soi Ratchadapisek 36 on July 5.
Police reviewed surveillance footage and found the victim, her husband and their daughters turned up at the condo on June 29 at night. The husband and the daughters left on July 1. There was no sign of Pisutthini leaving with them.
This prompted police to look for Mr Polprom for questioning.
Mr Polprom reportedly confessed to killing his wife.