it appeared the bottom of the shoe, both shoes, were soaked in blood. >> reporter: it seemed like damning evidence, but after testing that blood further -- >> it came back with two males and two females. >> reporter: again, nothing you can take to the jury. >> right. >> reporter: she tested some of the other evidence, but it didn't lead anywhere. >> reporter: this is more of jaclyn learning how to be a detective. >> yes. >> reporter: she took a week-long course on cell phone investigation taught by a former homicide detective. his name was sy ray, and he was a busy man. >> i said, hey, i have this case, and it's two years old. and i have this cell phone map and i can't explain it. >> reporter: one call stood out, an incoming call at 9:01 p.m.