While serving a 90-year prison sentence for selling marijuana, Richard DeLisi's wife died, as did his 23-year-old son and both his parents. Yet, 71-year-old DeLisi walked out of a Florida prison Tuesday morning grateful and unresentful as he hugged his tearful family. After serving 31 years, he said he's just eager to restore the lost time. DeLisi was believed to be the longest-serving nonviolent cannabis prisoner, according to the The Last Prisoner Project which championed his release. DeLisi was sentenced to 90 years for marijuana trafficking in 1989 at the age of 40 even though the typical sentence was only 12 to 17 years. Now, he wants "to make the best of every bit of my time" fighting for the release of other inmates through his organization FreeDeLisi.com. "The system needs to change and I'm going to try my best to be an activist," he said. Chiara Juster, a former Florida prosecutor who handled the case pro bono for the The Last Prisoner Project, criticized DeLisi's lengthy sentence as "a sick indictment of our nation." The family has spent over $250,000 on attorneys' fees and over $80,000 on long-distance international collect calls over the past few decades. Rick DeLisi was only 11-years-old when he sat in the courtroom and said goodbye to his father. Now, he's a successful business owner with a wife and three children living in Amsterdam. "I can't believe they did this to my father," the grieving son said. His voice cracks and his eyes well up with tears as he talks about how grateful he is to finally see his dad.