Rapid City, S.D. (KELO) -- Authorities in Western South Dakota are investigating a murder. They found the victim around 7 o'clock Tuesday night. In just a matter of hours, they identified a suspect and made an arrest.  Rapid City Police say 22-year-old Diontae Eagleman stabbed a man last n ight, just a block from city hall.  "Members of the Rapid City Police Department, and Pennington County Sheriff's Office responded to the scene and began investigating the incident as a homicide. During the course of the investigation, we interviewed several potential witnesses and we also reviewed video surveillance from different area cameras," RCPD Sargent Trevor Tollman said. Currently, the identity of the victim is still unknown until next of kin can be found. However due to the questioning authorities had with Eagleman, it is believed that this incident was not random in nature and that both Eagleman and the victim knew each other. "A couple of the interviews had focused our attention on a particular individual based on his age and clothing. That when we looked at video surveillance, we were able to realize this one person is who they were speaking of," Tollman said. Investigators sent that information to every officer in the city. Police quickly found Eagleman and brought him in for questioning, where he was later arrested.  "And then like I said, we just started working through past contacts through him and were able to locate him," Tollman said. Police are still looking for two others who were seen walking with Eagleman who may have more information on this ongoing investigation. As they continue to look for witnesses, police say there's no reason to believe there is any threat to public safety. ...read more read less