An autopsy has found no broken teeth or head injuries on the body of TV actress Nida "Tangmo" Patcharaveerapong, who drowned after falling from a speedboat into the Chao Phraya river on Feb 24, a forensic doctor said.

Speaking on condition of anonymity, the doctor at the Police General Hospital's Institute of Forensic Medicine (IFM) who conducted the autopsy said he found no broken teeth, while a check on the actress's skull found no signs of trauma from a hard object.

The autopsy came after actor and rescue worker Ekkapun "Tide" Bunluerit, who was among the first to see the body after it was retrieved from the river, told a TV show that Tangmo's face may have been struck by a hard object, as there was bruising around her right eye, with several teeth seemingly broken.

The doctor said the body had several wounds, notably a large one found on the right thigh.

Samples from Tangmo's body have been sent to two hospitals for an examination so the results are not available yet.

Tangmo, 37, fell into the Chao Phraya around 10.40pm on Feb 24 while travelling in a speedboat with five other people. Her body was found on Feb 26.