I've wondered whether steroid abuse or CTE or a combination of both possibly played a part in these behaviours since hearing of his passing. Despite his intimidating physique and fighting prowess Jimmy was noted for his kind nature and gentle demeanour outside the ring. Reading about this stuff does makes me wonder but I'm only speculating.
I believe his common law wife said he had memory loss from his boxing days. He took some punishment near the end of his career especially.