Donnie Wahlberg: From pop to cop

In the 2010 TNT series 'Rizzoli & Isles,' Wahlberg took a guest role as Lieutenant Joey Grant for two episodes.
Danny Feld
By: Rachel Kossman, Boston.com Correspondent
In the 2010 TNT series "Rizzoli & Isles," Wahlberg took a guest role as Lieutenant Joey Grant for two episodes.