Wagner, 38, was sentenced to life in prison plus 20 years in October for the robbery and murder of Stephen Pitcairn last year, as the young man walked home along St. Paul Street. Both he and his co-defendant, Lavelva Merritt, were on probation for other cases at the time of the attack.
"This proceeding reflects our commitment to using absolutely every tool at our disposal to ensure that repeat, violent offender remain in jail and off of our streets," Baltimore State's Attorney Gregg Bernstein said in a statement.
Merritt was sentenced to 15 years in prison last month for her role in the robbery. She is scheduled for a violation of probation hearing on Monday.