Was there an actual work injury or something that caused the stroke , or they had a stroke and then got injured when they fell?

Quite a gray area I think.
If you have a heart attack on the job and no one is stressing you out to cause it, is that still a work injury, or if you fall and hit your head hard on the floor because of the attack is that a secondary injury or ??.

Something for a expert wc atty opinion for sure.