Robert Stamps, one of nine Kent State students wounded in the Ohio National Guard shootings that killed four other students 38 years ago, has died. He was 58.

Stamps died Wednesday of complications from pneumonia in Tallahassee, Fla., his wife, Teresa Sumrall, said in an e-mail to friends, according to The (Cleveland) Plain Dealer. His death was confirmed by the Beggs Funeral Home in Tallahassee.

Stamps, an observer who was sympathetic to anti-war demonstrators, was shot in the lower back on May 4, 1970, while fleeing tear gas and gunfire during a protest against the U.S. invasion of Cambodia. He rode in the same ambulance as Allison Krause and Jeffrey Miller, both of whom died from their wounds.

Stamps grew up in the Cleveland suburb of South Euclid. He continued his studies at Kent State after the shootings, earning a master's degree in sociology in 1975 and a master's in journalism and mass communication in 1999. He worked as a counselor, author and musician and repeatedly called for the Guard shooters to be held accountable.