Francisco Manuel Lumbrales de Sá Carneiro, GCTE, GCC, GCL (Portuguese: [f??~'si?ku sa k??'n?j?u] (listen); 19 July 1934 – 4 December 1980) founded the Portuguese Social Democratic Party in 1974 (the year of the Portuguese Carnation Revolution) and became Prime Minister of Portugal in January 1980, but only held office for eleven months, dying in a plane crash with his partner, "Snu" Abecassis (born Ebba Merethe Seidenfaden), on 4 December 1980.
A parliamentary inquiry said in 2004 that there was evidence of a bomb in the aircraft, after a 1995 inquiry had concluded there was evidence of sabotage.