Native American activist Dennis Banks has died at the age of 80. Banks was the co-founder of the American Indian Movement helped lead the occupation of Wounded Knee in South Dakota in 1973.

Banks’ daughter tells the New York Times that her father died from complications of pneumonia following open heart surgery.

Banks led several violent uprisings protesting the treatment of Native American, he was also well known here in Central New York.

Banks took refuge on the Onondaga Nation in 1983. He voluntarily surrendered to South Dakota authorities and was sentenced to three years in prison for riot and assault with a deadly weapon charges for his role in the 1973 occupation at Wounded Knee.