The U.S. Attorney’s Office said they were in charge of prosecuting the case because Hernandez is "a member of a federally recognized Indian tribe" and that the crime occurred within the boundaries of the Cherokee Nation Reservation.
According to the statement, on June 5. 2019, Hernandez reportedly doused his mother and grandmother in gasoline and lit them on fire in a trailer. Witnesses reportedly testified that the two victims told emergency responders Hernandez put accelerant on their bodies.
Tulsa World reports his mother was 62 years old and his grandmother, who was in a wheelchair, was 79.
Hernandez remains in custody of the U.S. Marshals until his sentencing hearing.