 Addison pleaded guilty in a plea agreement in December 1997 to armed robbery and two counts of assault and battery with a dangerous weapon; the armed assault with intent to murder charge was dismissed under the plea agreement.He was sentenced to 2–3 years (to run concurrent with the prior sentence) in secure juvenile facilities and state prison in Massachusetts, with three years of supervised probation to follow release from prison on his 21st birthday.Addison was freed early on parole in September 2000.