I Found My Uncle On The Floor Of His House

I found my uncle on the floor of his house lying by his chair after I came from school. He had type 2 diabetes , kidney failure,high blood pressure, and congestive heart failure. He was on the floor lying on his stomach with both hands grabbing his chest and there was quite abit of blood on the floor where I found him. His face was very swollen and lip twisted. I want to know did he most likely die a painful death and was it a heart attack or something else.