From what I read yesterday, he had become more & more paranoid that his family were trying to cut him out of his mother's will.
They were, but for very good reasons - he owed money to HMRC and they were trying to stop them getting their hands on his inheritance.
He shot his brother first (in his bed), then the solicitor handling the will.
It is absolutely tragic: didn't the family talk to him & let him know why they were doing this?
The other thing that nobody seems to be following up is that it is claimed he walked into a hospital and asked to be sectioned, but was turned away. The hospital deny this. But if there is any truth in the story, that is shocking.