A week after the death of Nida "Tangmo" Patcharaveerapong, police are still trying to shed light on what really happened, while not ruling out any other possibilities
"We are not ruling out any possible causes of her death," chief investigator Jirapat Phumjit said on Thursday.
Police working on the high-profile case were investigating whether the 37-year-old actress accidentally fell from a speedboat and drowned in the Chao Phraya River on the night of Feb 24, or her death occurred as a result of the negligence of five other people on the speedboat.
Pol Lt Gen Jirapat, who commands the Provincial Police Region 1, said investigators would not hesitate to charge them if they have solid evidence to back up fresh allegations.
So far, police have filed charges against two of them - Tanupat "Por" Lerttaweewit and Phaiboon "Robert" Trikanjananun. Mr Tanupat owned the speedboat and Phaiboon was driving it at the time.
The two men were charged on two counts: the first with operating an unauthorised vessel and the second on the more serious charge of negligence leading to the death of a person.
"Robert was the one who drove the boat," Pol Lt Gen Jirapat confirmed.
The other three people on the boat were Idsarin "Gatick" Juthasuksawat, who was Tangmo's personal manager; her friend Wisapat "Sand" Manomairat; and Nitas "Job" Kiratisoothisathorn.
The actress reportedly went to the back of the boat to relieve herself.
Ms Wisapat said on Sunday she was looking at her mobile phone while the actress held on to her legs at the rear of the boat before slipping into the river.
Asked whether the cause of Tangmo’s death was confirmed, Pol Lt Gen Jirapat said other companions either told police that they did not see her walking to the end of the vessel or did not see her relieving.
Police on Wednesday night re-enacted the route and timing of the incident to find out whether it was consistent with the statements of the four companions and other witnesses.
Police had questioned 29 out of 37 witnesses before deciding whether charges will be brought against new suspects. The current suspects may also face more charges, he said.
"If we formally inform any suspect of the charges, we have to make sure that the case would go to court and we are ready to fight in court," Pol Lt Gen Jirapat said.