On June 2nd, 2007, at 6:30 p.m.,18-year-old Kelsey Smith went to the local Target in Overland Park, Kansas, to buy a gift for her boyfriend, John. Kelsey had just graduated from High School days earlier, was planning on going to Kansas State University in the fall, and was planning on studying veterinary medicine. She and John had been dating for about six months.
Once inside the Target store, she called her mom, Missy to ask where she might find gift wrap. Missy told her and Kelsey hung up the phone. At 7:30 John showed up at her house to take Kelsey on a date but Kelsey still was not home. Concerned, her father Greg and sister Lindsay set out to look for her. Eventually, at around 10 p.m. that evening, the worried father and sister found her car parked across the street from the Target at a Macy's store. There was still no sign of Kelsey.
Until June 6th, in a wooded area some 20 miles away in Grandview, Missouri, two hikers found her body. She had been sexually assaulted and strangled with her own belt. What transpired to determine her killer would involve a non-cooperative phone company, more than 40 surveillance cameras, and one incredible citizen tipster. 

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https://www.imdb.com/title/tt4219070/