A grand jury has indicted two Alna residents and a New Hampshire man on charges connected to the April 5 mugging of Boothbay artist Kathleen Billis in Portland, a spokeswoman for the Cumberland County District Attorney’s office said.

Brandon Smith, 25, of Alna, and Douglas Schneider, 24, of Exeter, N.H., are each charged with Class B robbery and Class B aggravated assault. Renee Monteiro, 25, of Alna, is charged with Class C theft. She had not been previously charged in the case, but had been named as a subject of the Portland Police investigation into the mugging.