The actual amount of killing and violence is condensed mainly into the last 47 minutes although the worst stuff isn't usually fully onscreen.
A woman threatens to harm a dog
A man is shown wearing another man's cut off face. Very gruesome and bloody.
A man bites a prison guard on the face (bloody), and then beats another prison guard to death. Very bloody and the bloody dead body is later shown for a long time.
A man is shot to death and blood sprays out of his body. He is later shown lying on the floor, dying with blood spraying from his mouth.
A dead body is shown on top of an elevator with lots of blood. He is shot in the leg (blood sprays), and then falls through the elevator. He is shown from the back, but torn skin on his head is shown, implying his face has been cut off.
Graphic crime scene photos are repeatedly shown. The bloody, decayed corpses in the photos are clearly shown, many with large chunks of skin cut off.
Menacing violence with frightening images.
We can see a rusty corpse that was in the water for many months, although it isn't seen fully, we can see some parts of it, including it's teeth.
The dead body of a prison guard is shown hung from a prison cell in a mimicry of the crucifixion scene. The guard's stomach is cut with guts hanging out, and the top of his head is ripped open as well. The camera pushes in on the body. Very bloody and graphic.
We see very graphic crime photos of the dead bodies of women in a lot of scenes. An autopsy scene shows the dead, nude, and decomposing body of a woman.
A man's decapitated head is found in a jar. Sudden.
An old woman's melted body is seen briefly in a bathtub of acid. Very graphic.
Brief references to cannibalistic acts.