While the show doesn't often show explicit or graphic violence, blood is seen in various episodes from time to time. Given the nature of this police show, there are of course many detailed, explicit discussions concerning murders, suicides, sexual violence, domestic abuse, wounds, autopsies an so on.
In one episode, 3 characters are critically shot, leaving another one guilt-ridden for the next couple of episodes. One of them has to undergo dangerous surgery so his ex-wife comes to stay with him.
A character kills himself.
A character falls into a deep depression after his wife is murdered.
Mentions of child abuse.
Munch throws a pervert against a wall after the pervert was caught for raping and murdering a girl he liked from high school.
Bodies are seen in an autopsy room.
Frequent mentioning of suicide, poisoning, death, the afterlife and murder.
Descriptions of bodily injuries, including a mentioned broken arm in a relationship and Pembleton bonding with a dying man whose body was mangled by a train.
Pembleton has a violent stroke on-screen and twitches rapidly.
A teenage couple kills a baby and buries it in a shallow grave.
We see the unpleasant aftermath of domestic violence in a few episodes, with women having badly bruised, slightly bloody faces.
A female character falls into grief after another kills himself.
A woman is shot in the foot.
A man is shot in the chest.
A man breaks his ribs in a car accident.
A golden retriever, mauled to death by a pit bull, is stuffed into a trash can. Falcone is disturbed by the pit bull owner's attachment to the dog.