A 19-year-old Ottawa man pleaded guilty Friday to two charges in connection with a January robbery and agreed to testify against any co-defendants in the case.

Trenton T. Rowsey admitted in court that he participated in a plan with co-defendant Mikael D. Englund, 22, of Richmond, on Jan. 31 to rob a Lawrence man who lived in the 800 block of Hilltop Drive. Lawrence police had alleged the man was held at gunpoint as the suspects stole marijuana, cash and an iPod.

Rowsey pleaded guilty to conspiracy to commit aggravated robbery and aggravated burglary, and defense attorney Hatem Chahine said as a condition of the plea agreement he won’t request probation in the case. Rowsey initially faced aggravated robbery and kidnapping charges.

Attorneys said they believed Rowsey faces a sentence of 31 months to 38 months on each count. At his Sept. 8 sentencing, District Judge Paula Martin will decide whether the sentences would run consecutively or concurrently. Rowsey, whose bond was revoked Friday, will also have to register as a violent offender because a firearm was used in the crime.

Englund is next due in court July 8. In addition to the aggravated robbery and kidnapping charges, prosecutors accuse him of committing a second robbery against the Lawrence man March 14 at the same residence. He faces charges of aggravated robbery, aggravated battery and aggravated intimidation of a victim in that case. A juvenile boy has also been charged in connection with the Jan. 31 incident.