Very sorry to hear but also not an uncommon way to go at all, especially as we get older. Probably didn't help that he lived alone and there was no one to call 911 but he probably enjoyed his solitude. It can be wonderful.
Both my grandfather and my dad died not long after taking bathroom falls, GF was in the shower and my dad just passed out and conked his head. Like I said, not uncommon. RIP, Pelican brother.