When did the jury of nine women and three men swing towards a second-degree murder conviction rather than believing the story of self-defence? Was it the dramatic forensic evidence of blood spatter expert Dr Stuart James?
The Florida-based expert, one of the world's leading authorities on blood spatter analysis, effectively recreated the last moments of the Limerick father-of-two's life in the early hours of August 2, 2015 in the bedroom of his luxury home.
He determined that Mr Corbett may very well have suffered the first of at least 12 horrific blows to his head while in or by his bed.
He also determined that Mr Corbett's head was repeatedly struck in a descending motion - in other words as he fell to the ground.