Luke scrutinized Darwin Morrison; the Canyon Police Detective Department listed him as a primary suspect mainly based on three points.
First, he was the last person the victim contacted, and the victim even texted him to meet on Highway 1;
Second, during the crime timeframe, he drove to Highway 1 but falsely claimed he hadn't been there, which is the most suspicious thing about him;
Third, the police found a shoe print at the crime scene that seemed to be left by the killer, and the deduced height and foot length are similar to Darwin Morrison.
Luke determined through footprint identification that the footprints at the crime scene were left by a woman, which did not match Darwin Morrison's gender or height, allowing the third suspicion to be ruled out, unable to prove that Darwin Morrison was at the crime scene.
As for the first two suspicions, they only prove that Darwin Morrison has some suspicion, but it's far from enough to convict him.
