Pete, how scary to witness something like that. It sounded as if you did the right thing by trying to restrain him and getting someone to call for help. Once the paramedics were there what more could you do? Even though you witnessed the end you couldn't have thrown more light on the cause for the cops either.
It's been a bit of a crazy week, maybe its the full moon! One of my close students who suffers from MS had her house burn down Wed night and that same night another friend lost her Mom. She was found dead by her sister and she was only 65! No known cause yet, we're assuming a heart attack. So it's been a fairly roller coaster week of emotions.
I hope you took PAlady's advice and relaxed with some music to just chill out. Shakes you up seeing trauma up close like that. Hope you're feeling ok now, golitho