The driver who allegedly caused a fiery crash that killed four people in Thornton in October has died from his injuries, bringing an end to the criminal investigation, police officials said Wednesday. The crash occurred at around 7:30 p.m. Oct. 26 when a Ford SUV carrying two adults and two children was stopped at a red light at Washington Street and Thornton Parkway. A Subaru sedan driver speeding on northbound Washington crashed into the back of the SUV, causing the gas tank to rupture and igniting the SUV. Related Articles Crime and Public Safety | Colorado on track to see deadliest year for police shootings since 2020, data shows Crime and Public Safety | Fatal Thornton crash, car fire caused by speeding driver, rear-end collision, police say Crime and Public Safety | Man dies after exchanging gunfire with Thornton police, injuring 2 officers Crime and Public Safety | Thornton police looking for missing 16-year-old boy Crime and Public Safety | Colorado man who posed as children’s life coach sentenced for sexually assaulting a 12-year-old The two adults and children were killed in the fire and pronounced dead at the scene, while the Subaru driver was taken to the hospital with serious injuries. He died from his injuries on Nov. 7, Thornton police said in a news release. Because of the man’s death, investigators cannot pursue criminal charges and the case is closed. The names of the four people killed, along with the name of the Subaru driver, have not been released by the Adams and Broomfield County Coroner’s Office. Family members identified the four people in the SUV as parents Francisco Díaz and Beatriz Núñez and their daughters Paola, 15, and Nataly, 10, according to Denver7. They are survived by their two sons, Adam and Daniel. Sign up to get crime news sent straight to your inbox each day.