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Who he was and where to find him. monika and michelle didn't want to wait for that. >> we were watching "cold case" and "criminal files", so we thought we were real detectives. >> too much tv can be a dangerous thing. or maybe this was the dynamic of the taylor family. the sisters who were going to together, al crystal resource on, we're now helping solve her murder. so, sketch in hand, they canvassed the neighborhood. you, not the police? >> she became so obsessed, it worries me halep says she was. she would say, he's not gonna get away with doing this to my baby sister. >> tia was afraid her...

Devastated, police said. more important, both men had alibis. witnesses put them nowhere near crystal's apartment at the time of the murder. the same was true of derek smyer. his neighbor saw him at 7:30 that morning. meaning he couldn't have shot crystal. does it sound like there's a whole lot of anybody at that point? >> no. >> but soon enough, there would be another person police would be looking at. coming up -- >> i came around the corner and there was a guy sitting on the stairs. he startled me a little bit. i kind of got this instinct that said, remember what he looks like. >> sisters t...

Waiting on the staircase, does that match the description of the guy people say were running away after the shooting? >> almost identical. >> reporter: here's the sketch drawn from both their descriptions. >> were you happy with the final sketch? it looked like the guy? >> oh, yeah. it looked like him. >> reporter: but he didn't look like any of the men in crystal taylor's life. not derek. not dino. and not javonte's father kenneth. cops would have to figure out who he was and where to find him. monica and michelle didn't want to wait for that. >> we had been watching "cold case" and "criminal...