A federal judge ruled that prosecutors failed to prove the executive knew about a pending congressional investigation into oil flowing into the Gulf of Mexico in 2010. The decision left in place a second charge against the executive, for allegedly making false statements to investigators about the oil flow rate.
The keyboardist co-founded the band after meeting Jim Morrison in California. The Doors went on to become one of the most successful rock 'n' roll acts of the 1960s. Manzarek, 74, died in Germany after a long battle with bile duct cancer.