State police say the investigation into the September shooting of an elderly Altavista resident by a town police officer is continuing. On Sept. 19, 83-year-old Delma Towler was shot and killed by Police Sgt. L.P. Rigney, a five-year veteran of the department. Officials say that there are not putting a timetable on the completion of the investigation. The commonwealth’s attorney in Roanoke has been appointed to review the investigation to determine if criminal charges are warranted. Rigney has been on paid administrative leave since the incident.