Ting Kai-tai, 24, told police he could only remember that he had gripped the girl's neck for "one or two minutes" in April as they played "vigorously" in bed, the South China Morning Post said.

In a police interview read out on Monday at the opening of Ting's murder trial, he said he could only vaguely remember telephoning the girl on April 27 asking her to have sex with him.

Ting, who admitted taking the drugs ecstasy and ketamine at a disco the night before meeting the girl, told police he later woke up to find Wong Ka-miu lying dead on the bed with blood oozing from her mouth.

He told police he then dismembered Wong's body and flushed the small pieces down the toilet. He also said he beheaded the teenager and dumped her head into the sea.

Investigators later found human tissue mixed with sediment in an underground sewer pipe at the building where Ting rented his flat.

Ting and Wong - who had previously met on a website specialising in compensated dating, a euphemism for prostitution among teenagers - had agreed to meet for a price of HK$1,500 (RM677).

Ting has pleaded not guilty to murder. - dpa