President Joe Biden, as one of his last acts on Monday, commuted the sentence of Leonard Peltier, a Native American activist who was serving life in prison after being convicted of killing two FBI agents 50 years ago on the Pine Ridge Reservation in South Dakota.

The president commuted Peltier over the objection of former FBI Director Christopher Wray. In a private letter sent to Biden earlier this month and obtained by The Associated Press, Wray reiterated his position that “Peltier is a remorseless killer,” and urged the president not to act.