According to police, all four people found dead inside the 6,000-square-foot Tampa, Florida mansion belonging to former tennis star James Blake had been shot. The authorities also found a gun registered to the father of the group, Darrin Campbell, who was living in the house with his wife and two teenage children. Police say all four people were shot with Campbell’s gun. While autopsy results are pending, police believe a murder-suicide took place. Campbell also reportedly bought $650 of fireworks and multiple empty gas cans just days before the fire, and during the fire, the fireworks kept the blaze going strong in combination with an accelerant.