Graham Dwyer was one of the most dangerous men this country ever produced

Chiefs don’t usually greet incoming prisoners, but Mr O’Sullivan wanted to look Dwyer in the eye.

As Dwyer was brought to the desk for processing, Mr O’Sullivan introduced himself. Dwyer did not reply, but shrugged “dismissively”, as if to ask “What am I doing here?”, said Mr O’Sullivan.

Dwyer (53) behaved exactly as expected. The investigation team had already established they were dealing with a sexual predator with narcissistic traits who was manipulative, intelligent and devoid of empathy.

The murderer no doubt drew heavily on those sociopathic traits to maintain his double life as a seemingly respectable architect who harboured an uncontrollable urge to stab and kill women.

After he was convicted for Elaine’s murder, Dwyer embarked on a nine-year crusade to overturn that conviction using every legal avenue open to him. The Supreme Court dismissed his final shot at freedom last year, citing “overwhelming and unanswerable” evidence against him.