The Thai police arrested Monday a man of Vietnamese origin for allegedly murdering his Thai girlfriend and dumping her body in a river the previous day.
Bhumin Somchaidee, 31, confessed to the killing of Napaphan Siharat, 29, and said he had planned to bury her body but decided instead to throw it into the Chao Phraya River while driving on a bridge north of Bangkok.
Two witnesses told the police that they saw a speeding pickup truck suddenly stop on the bridge and its driver hurriedly take a body from the back and throw it into the river before fleeing.
The police tracked down Somchaidee and his vehicle in Bang Pa-in District.
Two knives, a cleaver, a spear, and a shovel were found in the back of the blood-stained pickup truck, they said.
Somchaidee told them he had stabbed the woman twice in the neck and then slit her throat, Bangkok Post reported.
He claimed to have killed her because she did not repay a debt.
But the police suspect he murdered her because she was having an affair with another man.
They are searching for the body and investigating his motive.