In 1999, Coretta Scott King, King’s widow, along with the rest of King’s family, won a wrongful death civil trial against Loyd Jowers and “other unknown co-conspirators”. Jowers claimed to have received $100,000 to arrange King’s assassination. The jury of six whites and six blacks found Jowers guilty and that “governmental agencies were parties” to the assassination plot.
Debate over a conspiracy remains to this day. Here’s Part 1 of an episode of the classic 80s television show Unsolved Mysteries devoted to this question: