Nokomis Police are investigating a Friday night murder-suicide at the Dollar General store, the former Kroger, at 415 North Spruce.   Police Chief Talon Burton tells us, just before closing time in the moments before 10 pm last night (Saturday 3/15), a 22-year-old woman, an employee of the store was shot and killed by a 47-year-old Nokomis man described as her estranged boyfriend.    He died after being transported to HSHS St. John's Hospital in Springfield.  Nokomis Police are continuing their investigation.