his lover sophie menuet and his estranged wife, susan kirschenbaum seen here in a facebook photo. >> did bring her in and speak to her. >> who wanted this divorce? rob or susan? >> i think they both wanted it. it was a mutual decision. >> reporter: still, the detective says, rob's estranged wife seemed devastated by his death . according to susan, she'd been at home and on the phone with a friend on the night of the murder. >> nothing really led us to believe that she had any involvement in this. >> reporter: over in manhattan, detective love met with the other woman in rob's life, sophie meneut. >> she was crying. she knew that he was deceased. >> did you tell her that he had been murdered? >> later on in the interview, yes. >> what was her reaction. >> she was shocked. like anyone would be if you found out that information. >> reporter: sophie told the detective that she'd seen rob hours before he died. >> rob, with his two friends had gone to new york city to meet sophie and her daughter, her eight-year-old daughter at a museum. >> how open is sophie to you? >> she was a very open