so you can give them everything you've got. >>> detective dimitry ruvin has worked a lot of homicides. but the death of eric somuah angered him more than most. >> you know, he was just sleeping. to kill somebody while they're sleeping is just -- it's horrible. >> reporter: eric's sisters were grateful to have someone as committed as ruvin working their brother's case. >> he is a phenomenal investigator. >> reporter: and now just days after eric was murdered, it looked as if detective ruvin might give the family some resolution. one of eric's lovers, katrina ben, handed the investigators a new suspect, eric's pot dealer. >> it didn't make sense to me. because i was thinking, why is he here? >> reporter: katrina told them how uneasy she felt with the dealer in the apartment. >> it was just a little uncomfortable. he just seemed a little weird. >> reporter: so at just around 5:00 a.m., katrina said she got out of there. >> she said the guy then just came up to her as she was leaving and basically pushed her out with the door. >> reporter: based on katrina's account, the police believed e

this was a murder. >> reporter: in some ways, dimitry ruvin was like eric somuah.ung, successful, driven. but even working homicides, he had none of the world weariness of some veteran detectives. so he was the right cop to break the difficult news to the family. >> i just went downstairs and i said we have reason to believe that eric was murdered. that's when everybody lost it. i mean, his sister was just crying. his dad had just had his, you know, head buried in his hands and just like -- people just couldn't believe it. >> we were all in shock. we were just shocked. >> who would want to murder eric? >> reporter: that is exactly what detective ruvin wanted to know. >> we started right there. we started our investigation with the family and those that were close to him. just to see if he had any enemies, if there was anybody in his life that would want to hurt him. >> reporter: what's the answer? >> the answer is eric was loved by everybody. and there was no one out there that the family knew that would want to hurt him. >> reporter: eric's head wound, from a .380

. >> reporter: the family had pointed detective dimitry ruvin at eric's girlfriend, denise. >> we interviewed denise multiple times. >> reporter: ruvin's interest in denise picked up when he learned from the family that her romance with eric was on the rocks. >> he was with her probably about a year. and then after awhile he was just tired of being, i guess, bogged down by someone. >> reporter: according to ruvin, denise told him that she and eric were talking about breaking up by mutual agreement. ruvin said she also acknowledged relationship, giving the detective a theory to consider. older woman, younger man. maybe see somebody else. >> right. >> reporter: and that breeds leads to. jealousy leads to murder. >> reporter: while he continued to investigate denise, ruvin building that there was a woman there he'd been dating for just >> that's why we wanted to talk to katrina. >> reporter: katrina ben came down to police headquarters for an interview. she's visibly upset here. just earlier that day, detective ruvin and his partner had told her that eric was dead. >> i just want to start again