There is some kind of violent act or depicted death in almost every episode in the series.
Many bloody shootings/stabbings, most of which are fatal.
Many fistfights. Some only result in injuries while others are fatal. A lot of blood during these, as well.
Anytime someone dies, there is almost always a realistic amount of blood and/or gore present.
Some characters are known as "immortals," which means they cannot truly die through any means. If they happen to be killed by someone or something, their wounds instantly heal and they return to life moments later. Their spilled blood or severed body parts return to their bodies as well. One of the immortals is drowned in concrete repeatedly due to his immortality.
Any time an immortal is injured or killed, we see the injury and also the blood and/or body parts returning to the person's body and reattaching itself
A man has his fingers cut off
A man's arm is reduced to a bloody stump with a bone protruding from the wound
A man has his fingers broken, we see his hand afterwards, with bones sticking out of most of his fingers
A man punches another man's face until it becomes a bloody pulp, we see many of the impacts and the end result of the beating
Two men have their throats slit, very bloody
A man is shot in the forehead onscreen, very bloody, a large exit-wound is visible on the back of his head
A small child is shot in the head with a shotgun on-screen, causing his head to explode and a large amount of blood to spatter the room (he is an immortal who is hundreds of years old and cannot die from his, but the visual is what it is)
This same child has his throat crushed by another character who grabs it and digs his fingers into his flesh, also very bloody
This child has his fingers bitten off by another character, we see the fingers spat out onto the floor and the bloody hand
This child also has his hand held down onto railway tracks while on a moving train, we see his fingers become mangled and his whole hand is bloodily destroyed on-screen
a man is decapitated
Many characters are riddled with bullet-holes
A man has his arm and face held down onto railway tracks, while on a moving train, very bloody. We see his disfigured corpse thrown back into the train and in many other scenes
Some immortals kill each other by "consuming" each other, involving the victim's body literally being sucked into their killer's. All that's left behind are their clothes.
Some characters also die through other means, such as being ripped apart, burnt to death, killed in explosions, falling to their deaths, hit by vehicles, etc.
Some torture, both implied and seen.