He’s one of Ireland’s most sinister and twisted killers who groomed his vulnerable victim and gave her take a starring role in her own murder.

In this two-part Crime World special, written by Niamh O'Connor, we look back on the gruesome details of Graham Dwyer's relationship with Elaine O'Hara, and her tragic, brutal killing.

We hear the text messages that passed between the pair in the days before her death, and get a glimpse of the sickening bloodlust hidden inside this seemingly ordinary family man.

And we learn how, over a year after her death, a series of miracles would lead police to Elaine O'Hara's body — and her killer.

The story of Graham Dwyer and Elaine O'Hara is a shocking one, so, if you're squeamish, this episode isn't one for you. And it definitely isn't one for a younger audience, so be mindful where you listen to it.

Crime World, with Nicola Tallant, is a weekly Iri…