RAPID CITY, S.D. (AP) — Police have identified the two victims found fatally shot in a park in western South Dakota earlier this week. Authorities say 26-year-old Charles Red Willow, a local man, and 29-year-old Ashley Nagy, of Greeley, Colorado, were found dead from multiple gunshots in Thomson Park in Rapid City Monday night.

Investigators believe the two knew the shooter, but a suspect hasn’t been identified. They say evidence at the scene leads them to believe the shooting was drug-related. Police have declined to say what evidence was found.