On a summer evening in July, 46-year-old Heather Sue Campbell was shot and killed in the parking lot of a Buffalo Wild Wings in Hummels Wharf, near Selinsgrove, Pennsylvania. She had been on a date with 52-year-old Matthew Bowersox of Mifflinburg; both were gunned down after sharing an embrace in the lot.

Authorities say the shooter was 55-year-old Christopher Fernanders of Paxinos, Campbell’s ex-husband. The attack was premeditated: Fernanders had been stalking Campbell, had placed a GPS tracker on her vehicle, and Campbell had obtained a protection-from-abuse order after he threatened her life. A letter found in Fernanders’ vehicle reportedly detailed his plan to kill Campbell.

As Fernanders was returning to his truck, an armed bystander, Troy Sprenkle of Sunbury, who had been waiting inside the restaurant, confronted Fernanders and shot him multiple times, wounding him. Fernanders was charged with two counts of first-degree murder, stalking, and violating a protection order and was recovering under guard at a medical center while awaiting arraignment. The Snyder County District Attorney said the bystander’s use of deadly force was justified and he would not face charges.

Did anyone see Heather or Matthew at the restaurant that evening or notice a vehicle following them beforehand?