War of Hathor

Adel Orson is a former Marine and single father. One day he gets a call from his son, who tells him an active shooter is on campus. Adel grabs his pistol and races to protect his son. While stopping the school shooter Adel is killed in the crossfire. He then wakes up in a small room. It turns out to be an inn and he is no longer a middle-aged man but a young man. His new name is Matthew Tequiti a demihuman who happens to be the protagonist in an RPG his son liked.