Share Tweet Pin Email By Molly Claire Goddard 8:47am PST, Nov 7, 2025 _ Exiled Spanish King Juan Carlos opened up about accidentally taking the life of his younger brother.Keep reading to learn what happened...MORE: Follow Wonderwall on MSN for more top news _ In Juan Carlos' memoir, Juan Carlos I d'Espagne: Réconciliation, the disgraced royal recalled killing his 14-year-old brother Alfonso de Borbón while they were playing with a Star Bonifacio Echeverria automatic pistol. "I didn't like to talk about it. This is the first time I do.