Murderer Behind the Mask S01E02 - Episode 2

Graham Dwyer is arrested for the horrific murder of Elaine O Hara. He denies it and believes he's covered his tracks so well that there won't be enough evidence to charge him. But he has underestimated the police investigation. In interview he unwittingly corroborates the police evidence against and is charged with murder. But without a cause of death do the police have enough to convict him?