Did Max de Winter kill Rebecca?

The short answer is yes.

In the story, Rebecca is Maxim de Winter's first wife. She dies after Max shoots her.

Accordingly, Max and Rebecca had an unhappy marriage. When Rebecca was alive, she engaged in sexual affairs with different men. Max looked the other way as long as Rebecca was discreet and did not embarrass him. However, Rebecca soon became complacent and careless. She carried on her affairs openly, which upset Max greatly.

In...

The short answer is yes.

In the story, Rebecca is Maxim de Winter's first wife. She dies after Max shoots her.

Accordingly, Max and Rebecca had an unhappy marriage. When Rebecca was alive, she engaged in sexual affairs with different men. Max looked the other way as long as Rebecca was discreet and did not embarrass him. However, Rebecca soon became complacent and careless. She carried on her affairs openly, which upset Max greatly.

In due time, Rebecca had an affair with Jack Favell, a cousin of hers. When Max confronted Rebecca about it, she taunted him. During their confrontation at the cottage, Rebecca also revealed that the child she was carrying was Favell's. Max became so angry at the revelation that he shot Rebecca through the heart.

Then, he took the boat out and deposited Rebecca's body in the boat's cabin. According to the text, Max sunk the boat in the bay that night. So, Max de Winter killed Rebecca because he felt that she had betrayed him.