Roberts pleaded guilty to 17 burglary counts and single counts of safe-cracking, engaging in a pattern of corrupt activity and conspiracy to engage in a pattern of corrupt activity.
Five gun specifications (which would add prison time) were dismissed Wednesday by prosecutors as part of the plea deal.
Both are serving five-year prison terms arising from charges in Warren County cases. Prosecutors in Miami County also agreed to recommend the 15-year term run concurrent with the Warren County sentence.
Miami County Common Pleas Judge Jeannine Pratt said Roberts faces a maximum 91.5 years in prison and fines totaling more than $200,000. Sentencing is scheduled for Sept. 24.
Roberts and Burgin were scheduled for trial next week in Miami County. Paul Watkins, assistant county prosecutor, called the case "very involved” and told the court more than 60 subpoenas had been issued for trial.
A plea hearing for Burgin is scheduled for Aug. 20.