It is accidental - he strokes her hair too hard, forgets to let go and breaks her neck in the process.
Similar to how he kills the mice and the puppy by mistake, this is also a circumstance where he underestimates his own strength and doesn't realise how what he is doing is wrong.
When he is stroking her hair, she tells him to let go, but he panics and instead of doing so holds on. She then begins shouting and screaming as she is scared, which makes him angry as he doesn't want anyone else to hear or else George will angry with him - George told him not to talk to Curley's wife so he is desperate not to get caught. When she doesn't stop screaming, he keeps holding on, still panicked, before his shakes her and her neck breaks.
Also: "Her body flopped like a fish." - same as Curley when he gets his hand broken - "Curley was flopping like a fish on a line."
George killed lennie and the other was lennie killed curlys wife
she knows that curley's injury was not made from the machine but that curley had a fight with someone. then she sees that lennie's face is all bruised and injured and immediately knows that there had been a conflict between lennie and curley
In John Steinbeck's novel "Of Mice and Men," Curley's wife dies accidentally when Lennie snaps her neck during a struggle in the barn. Lennie was trying to quiet her because she was screaming, and he didn't understand his own strength.
Curley's wife tells Crooks, Candy, and Lennie about her loneliness and desire to connect with someone. She confides in them, sharing her frustrations and dreams, hoping to bridge the gap between herself and the other ranch workers.
get back to school & research it yourself
okay so his wife dies at page 1
He strokes her hair to hard, she gets scared , he freakes out and chokes her to death trying to keep her quite.
Curley's wife confided in Lennie because she felt lonely and trapped in her marriage. She saw Lennie as someone who would listen without judgment and who could offer her a brief escape from her isolation. Additionally, she may have been seeking attention and validation from someone other than her husband.
Lennie was obsessed with soft objects. Curley's wife allowed Lennie to touch her hair and couldn't stop. Lennie was so strong he broke her neck.
Chapter 5 page 91-92
It never happened as lennie killed curlys wife and a vigilante group was sent to kill him but george found lennie first and shot him in the back of the head while telling him about the dream and as lennie was not around anymore he couldnt do it without him
Lennie accidentally killed Curley's wife while trying to stop her from screaming during a struggle. Lennie, who has a tendency to be rough without realizing his own strength, unintentionally caused her death in a moment of panic.