Guyot participated in the 40th anniversary of the Freedom Summer Project to make sure a new generation could learn about the civil rights movement.
"There is nothing like having risked your life with people over something immensely important to you," he told The Clarion-Ledger in 2004. "As Churchill said, there's nothing more exhilarating than to have been shot at — and missed."
His daughter said she recently saw him on a bus encouraging people to register to vote and asking about their political views. She said he was an early backer of gay marriage, noting that when he married a white woman, interracial marriage was illegal in some states. He met his wife Monica while they both worked for racial equality.
"He followed justice," his daughter said. "He followed what was consistent with his values, not what was fashionable. He just pushed people along with him."
Susan Glisson, executive director of the William Winter Institute for Racial Reconciliation at the University of Mississippi, called Guyot "a towering figure, a real warrior for freedom and justice."
"He loved to mentor young people. That's how I met him," she said.
When she attended Ole Miss, students reached out to civil rights activists and Guyot responded.
"He was very opinionated," she said. "But always — he always backed up his opinions with detailed facts. He always pushed you to think more deeply and to be more strategic. It could be long days of debate about the way forward. But once the path was set, there was nobody more committed to the path."
Glisson said Guyot's efforts helped lay the groundwork for the Voting Rights Act of 1965.
"Mississippi has more black elected officials than any other state in the country, and that's a direct tribute to his work," she said.