The 22 is way more deadly than gun bigots want to believe, that said I would rather be hit by a 22 at 200 yards than a 308, but the 22 can kill you with a well placed shot. Do some research the 22 rifle was used by the Germans as a Sniper rifle, I had one of those as a kid and they were dead accurate.
That being said I had a classmate that tried to kill herself with a .22 handgun - bullet went in and basically skimmed her skull/brain. She lived. Her personality changed dramatically, but she lived with no issues. I still pray for her.
I’ve seen other reports it was an AR type rifle (223/5.56 - close to 22 caliber but MUCH more powerful and much longer range).