Face of a murderer: O'Sullivan refused to accept responsibility throughout Nicola Collins trial

At times during his interviews with gardaí and in his court testimony, Cathal O’Sullivan spoke tenderly of the woman he killed - but at other times he dragged her character through the mud.

That was never more evident than in his account of how she came to have 125 bruises and lacerations from her ankles all the way up to her scalp.