Marshall was destined to assume the role of hereditary chief of the Mi'kmaw Nation when, in 1971, he was wrongly convicted of murder. He spent more than eleven years in jail before a royal commission exonerated him and exposed the entrenched racism underlying the terrible miscarriage of justice. Four years later, in 1993, he was charged with fishing eels without a licence. With the backing of Mi'kmaw chiefs, he took the case all the way to the Supreme Court to vindicate Indigenous treaty rights in the landmark Marshall decision.

Marshall was only fifty-five when he died in 2009. His legacy lives on as Mi'kmaq continue to assert their rights and build justice programs grounded in customary laws and practices, key steps in the path to self-determination and reconciliation.