How should I best approach researching a murder/ suicide with only sketchy details?

How should I best approach researching a murder/ suicide with only sketchy details? I know it happened around Reno, NV, about 5 years ago. A former disgruntled employee shot and killed the former employer after stalking him for many years. And the incident happened as the victim exited a Big 5 Sporting goods store. Within 2 days, the ailant committed suicide.