How does Neil die in once upon a time?

In "Once Upon a Time," Neil Cassidy, also known as Baelfire, dies in Season 3 during a confrontation with the Wicked Witch of the West, Zelena. He sacrifices himself to save Emma Swan and their son, Henry, by allowing himself to be killed while trying to protect them. His death is a pivotal moment that impacts the characters deeply, especially Emma, who is left to cope with the loss of her true love.