Differential association theory

Differential association theory can be seen in the show I'm currently watching. There is a group of  five people together and one of them accidentally kills a man. Four out of the five people there had nothing to do with the murder however the group all pressured each other to stay and help cover up the murder. Any of the four that were not involved could have just called the police but they felt pressure from the group to just stay and help cover it up.

These are the people involved with the murder. 

This is the man that was killed. 

Here is the scene from the show of the murder.