Luckily the Police did not murder anyone at the G20. However, there is documented evidence of rubber bullets that were fired into peaceful crowds. If one of these bullets hit someone in the gentiles, eye or certain parts of the head, it could have caused very serious injury or even death. There were many cases where multiple police officers would pile on top of petite young men and women and punch and kick them while they are being held down.
This video shows that the Toronto Police are capable of literally beating someone to death and then covering it up.