SPOILER: Why did the murderer do what he did to the victim?

The assailant sanitized the victim's body using bleach applied externally (skin) and internally (vagina, uterus, mouth, throat, stomach, anus, rectum, colon, etc.) to destroy any of his body fluid remnants (semen, saliva, blood, bloody urine, etc) that could positively link him to the assault through forensic DNA analysis.

Peace! 


On November 6, 2012 god blessed America...again. 

I just watched the movie and there was nothing alluding to his "being her date."

Marzin first spotted Carolyn at the annual picnic for her mother's counterterrorism agency, but they apparently never met. Marzin was a snitch for the agency, and was invited to the picnic by the agent he was secretly working with.

The original evidence that tipped off the investigation was a group photo taken at the picnic, showing Marzin kind of off to the side and staring across the group at Carolyn. He became obsessed with her and kidnapped her several days later when she went to a bakery to order a cake for her mother's birthday. The theory (which was never debunked) was that Carolyn must have rebuked his advances, so he raped and killed her, then bleached away all forensic evidence.

There was no mention of his childhood or anything that would have helped explain his horrific act. The focus of the story was not on what motivated Marzin, but on the investigation itself and the toll it took on the mother and her friends at the department.