you are going to have to complete 12 labors because you killed someone and if you don't you wont be forgiven
Hera Hated Hercules and put snakes in his room to try and kill him but at the end he ended strangling the snakes and killed them.
Again Hera hated Hercules and made him mad which caused him to kill his family
In order to erase this sin. Hercules got assigned 12 almost impossible tasks to be forgiven.
during one of these tasks, he was approached by a lion and had to kill him. He tried to shoot it with a bow and it didn't work. after it didn't work he had to strangle it to kill him.
Hercules ended up completing all 12 tasks he was given with help from his hero traits.
Once Hercules died he went on to live with the other gods including his father Zeus in mount Olympus