Jack Torrance dies due to the harsh environment. He was lured into the maze while in a state of madness. As he chased his son, he couldn't find his way out. The cold got to him and he froze to death. His death was a result of his own actions and the malevolent influence that had taken over him during his stay at the hotel.
Jack meets his end in a rather chaotic and terrifying way. He gets lost in the haunted hotel's madness and is ultimately overcome by supernatural forces.
I'm not sure which 'fifth personality' you're referring to. If you can provide more information, I will try my best to help you find the relevant anime pictures.
Often, his relationship with his bandmates can be a theme. How they interact during rehearsals, on tour, and in the studio. Also, his influence on the music scene might be explored in fanfiction. Some stories could be set in an alternate reality where Jack White's music has an even greater impact on popular culture than it already does, and how that changes the music industry and the lives of the people in the story.
The 'White Lotus' has various storylines and characters. If Jack is a relatively minor or new character, there might not be widely known back story information readily available. It could be that he is a character created for a specific arc within the show, perhaps related to the guests or staff at one of the White Lotus resorts. Without more details, it's hard to define his back story precisely.
The death of the second novel, White Snow Goose, could not be confirmed because the novel had not been officially released or authorized to be released. Therefore, only the author or copyright owner could confirm the plot and details. In addition, the plot and the death of the characters in the novel are often changed and updated, so it may be necessary to wait until the novel is published to obtain an accurate answer.