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Last week’s appeals court ruling said an investigator in the Boone County prosecutor’s office should have shared details about an interview he had with Mr. Trump’s wife that would have raised questions about Mr. Trump’s account. The appeals panel cited that as part of a pattern in which prosecutors failed to disclose evidence to Mr. Ferguson’s attorneys.

Court documents filed by his attorney said Mr. Ferguson plans to live with his mother in Columbia and hopes to work for his father, who is a real estate broker. Mr. Ferguson said Tuesday that he has nearly finished writing a book about his experiences.

In an interview on ABC’s “Good Morning America,” Mr. Ferguson said he was starting his new life with nothing except the clothes on his back — the same clothes he wore at his news conference the night before.

“I’m going to just remain optimistic and see what happens, and if nothing comes down the road, I’m going to create my own opportunities,” he said.

Many in the crowd at Mr. Ferguson’s Tuesday-night news conference had never met him but were drawn to his cause by his father’s relentless efforts, a social media campaign and national TV news reports.

Margie Kunz, 45, of rural California, Mo., wore a “Free Ryan Ferguson” bracelet on her right wrist. She said that after seeing media reports about Mr. Ferguson’s case, she befriended his family and contributed $500 to their quest for his freedom.

“I just became convinced that he was innocent — that’s when I started getting on Facebook and getting involved,” Ms. Kunz said.