King Juan Carlos of Spain is one of the most popular Kings in the world. But few know of the shocking tragedy that haunts his youth. At age 15, Juan Carlos’s younger brother Alfonso died of a gunshot wound to the head in the family home. His death was officially ruled an accident – but questions remain about how and why he ended up dead. From the beginning, newspapers have claimed that Juan Carlos held the gun that shot his brother. And some believe it wasn’t an accident. Could this popular King be responsible for his own brother’s death?