It's the case that continues to haunt the college town of Bloomington, Indiana: What happened to Lauren Spierer?
The college sophomore disappeared after one night out. Now, more than four years later, her parents are hoping some new clues can help crack this cold case.
Spierer, 20, a pint-sized blue-eyed blond beauty, went out for a night of partying with friends. She disappeared in the early-morning hours of June 3, 2011.
Police spearhead a massive search. More than 3,000 tips pour in. Cops have gathered close to 200 pieces of evidence, but there are still no answers for her heartbroken parents.
What investigators do know is that Spierer is not the only Indiana University student to mysteriously vanish.
In May 2000, freshman Jill Behrman, 19, went out for a bike ride and never came back. Three years later hunters discovered her remains in a swampy reservoir 15 miles from campus with a fatal gunshot to the head.
Hannah Wilson, a bubbly 22-year-old IU senior, went out for a night on the town with friends on April 23, 2015. She hopped in a taxi at Kilroy's Sports Bar, the same bar Spierer was seen leaving the night she mysteriously disappeared. Wilson's bludgeoned body was found 10 miles from campus the next day.
Daniel Messel was arrested and charged with killing Hannah Wilson. Police still consider him a person of interest in Spierer's case.
John Myers II was convicted of the murder of Jill Behrman. He was sitting in prison when Spierer went missing.
Police say Spierer could be the victim of a copy-cat killer, or may have been a random abduction. But her parents wonder if the person responsible is someone who knows their daughter very well.
Crime Watch Daily is working with Bloomington Police investigators to assemble the details of the 4 hours before Lauren Spierer went missing.
June 3, just after midnight: Spierer leaves her Smallwood Plaza apartment and heads to fellow student Jason Rosenbaum's party at 5 North townhomes. It's the beginning of a night of heavy drinking.
Around 1 a.m., Spierer leaves Rosenbaum's party with another friend, Corey Rossman. They head to Rossman's apartment just down the hall where they continue to drink and party.
1:46 a.m. Spierer and Rossman walk down the street to Kilroy's Sports Bar. Witnesses say Spierer is already drunk and barely able to stand.
Police later find her shoes and cellphone at the bar.
2:27 a.m. Spierer and Rossman head back to her apartment. They never get to her room. Once inside the complex, investigators say Rossman argues with another student and gets punched in the face.
2:48 a.m. Spierer and Rossman head back to Rossman's place through a dark alley. Witnesses say Spierer is so out of it now that she falls and hits her head, and Rossman has to carry her.
Bloomington Police found Spierer's identification and keys in the alley.
At around 3 a.m. the two get back to Rossman's apartment. Rossman says he passes out. He then claims he suffered amnesia from getting punched in the face earlier, and tells police he remembers nothing about that night.
Rossman's roommate, Michael Beth, says he begs Spierer to spend the night on their sofa, but she refuses. Beth tells police he calls Jason Rosenbaum, the guy Spierer was partying with earlier, to come get his friend. Michael Beth claims that's the last time he ever saw Spierer.
4:15 a.m.: Rosenbaum walks Spierer back to his apartment. He tells police she wanted to go home. So he watched her walk to an intersection from his balcony. He claims a shadowy figure approached Spierer when she turned toward her apartment. Spierer never made it home.
The last three people to see Spierer -- Jason Rosenbaum, Corey Rossman and Michael Beth -- all retained lawyers immediately and now refuse to talk.
That leaves Spierer's parents very suspicious, but none of the young men has ever been named a suspect.
Police say they checked all 14 of the surveillance cameras in the area looking for that shadowy figure. They came up empty.
It's been four excruciating years, but Rob and Charlene Spierer still cling to the hope that someone out there knows something that will help bring Lauren home, and the person responsible to justice.