Leonard Peltier, the Native American activist who has always maintained his innocence in the killing of two FBI agents 50 years ago, returned to his home Tuesday in North Dakota hours after his release from a federal prison in Florida after then-President Joe Biden commuted his two life sentences.

Indigenous activist Leonard Peltier is set to be released from a Florida prison Tuesday based on former President Joe Biden having commuted his life sentence for the 1975 killings of two FBI agents, a decision that elated Peltier’s supporters while angering law enforcement officials who believe in his guilt.

Mr. Peltier’s murder conviction and two life sentences, stemming from a 1975 shootout with F.B.I. agents on a reservation, have been widely criticized.