A boy's neck is snapped, and we see a few people moments after death.
An arrow sticks out of a boy's chest after he is shot.
A girl is poisoned, her skin is light blue.
A girl is killed by a flying spear and pulls the weapon out of her chest before dying. Blood soaks her shirt.
Another girl is swarmed by violent poisonous wasps and is killed by them. We briefly see her incredibly swollen body.
Katniss receives severe burns from a forest fire.
A girl is slammed into a wall, snapping her neck.
Peeta and another boy roughly punch each other and wrestle.
Katniss receives a knife slash across her head.
An explosion is triggered.
The opening fight of the games implies a few deaths, we briefly see blood splattered onto the ground and other objects, and throughout the games, we see open wounds (no longer bleeding) on many of the characters. A group of older teens travels as a pack and hunts down young children, there are a few just-offscreen stabs and kills. They find a teenage girl at night, alone, and we hear her screams, implying death.
Video footage shows a past Hunger Games, where a boy beat someone to death with a brick. We see the beating partially, with the blood covered brick being raised into the air and brought down hard, almost out of view.