Wendy Murphy represented some of Chapman's victims and fought to keep him behind bars.
"You don't have to know Wayne Chapman’s history to find him guilty on a case where there's video proof of the crime," Murphy said. "I'd really like to know what planet the jury was on when they were coming up with this verdict."
Chapman was released from custody and wheeled into a waiting car.
The state's sex offender registry lists the level 3 sex offender as homeless and now living on the streets of Boston.
"Who is that first child Wayne Chapman sees? Who is that first child Wayne Chapman gets a look at?" said Melanie Perkins McLaughlin, a friend of one of Chapman's alleged victims.
Perkins McLaughlin notes that Chapman is a suspect in the disappearance of her friend Andy Puglisi 43 years ago in Lawrence.
"I was with him the day he disappeared, and Wayne Chapman is the main suspect in his disappearance," she said.
Chapman has admitted to molesting up to 100 boys. He served 40 years, including time on civil commitment for a conviction of child rape in Lawrence.
But the Middlesex jury was not made aware of any of that. Prosecutors alleged Chapman intentionally exposed himself to staff at MCI Shirley last June.
Hours of prison surveillance and testimony from prison staff didn’t sway the jury.
"When he reoffends, and he will, I hope the media and everyone else holds the people who helped him get released accountable," Perkins McLaughlin said.