It looks like the court case along with the sudden sharp decline in his career has seriously taken a toll on him.Pleased for him. He looks terrible and has aged so much probably from the stress.
Sounds like the victim partly fell over, hit his head and fractured his skull. An accident. Unfortunate but no blame.
I have a relative who hit his head on the curb sustaining a serious head injury, his family were convinced someone must have hit him and wouldn't accept the police telling them the CCTV showed him falling of his own accord, they then decided someone must have hit him before he came into view of the CCTV. When someone is drunk they tend to go down hard and fast.