The final scene features Eddy weeping in his son’s bed, surrounded by Jamie’s belongings and toy teddy bear. He gives the bear a small kiss, and tucks it into bed — something he probably won’t be able to do with his own son ever again.

Dive into the shocking ending of Netflix's No. 1 crime series, "Adolescence." Why did Jamie kill Katie, and what happened to him and his family in Episode 4?

They are eventually told that, while messages between Jamie and Katie appeared to be friendly, the emojis actually suggested that Katie was mocking Jamie for being an incel—meaning involuntary celibate, which is connected to the rise of misogynistic culture, particularly among young men.