This case was nothing but a hate-fuelled/filled session in court as each in turn had an axe to grind with the other and because of the reams of paperwork handed in by those with huge grudges, the actual crime itself, its cause and motive were put to one side making/treating any evidence on a circumstantial basis.
The crime, such as it was would certainly have been handled differently today, with better policing and also a far better understanding of this particular type of crime. An example being how much further on in 34 years that those involved in this particular case have found, with many anomalies which have been unearthed. It's going to be a huge embarrassment to the justice system eventually.