INDIANAPOLIS - The parents of missing Indiana University student Lauren Spierer told Katie Couric they're frustrated that the last people to see their daughter haven't come forward with details about her disappearance.
Robert and Charlene Spierer appeared on "Katie" on Monday as part of an episode about the families of missing children.
Robert Spierer was outspoken in his frustration with the friends his 20-year-old daughter was with before she was last seen walking toward her Bloomington apartment the morning of June 3, 2011.
"I'm angry. We've been stonewalled, to some extent, by the last people to see Lauren," he said. "Despite their claims of doing whatever they could do, the fact of the matter is they refuse to meet with us, except for one of the boys, they refuse to take a police polygraph, which we feel is important for a number of reasons, one of which is to help narrow down the field of people who really know what happened to her that night."
Couric also asked Charlene Spierer if she has a theory of what happened to her daughter.
"I think that's our biggest dilemma is not knowing if it was a random abduction or if it was someone that Lauren knew," Charlene Spierer said. "For me personally, I think the events of the evening leave me with thinking it was someone who knew Lauren."
She broke down in tears recalling when she and her husband visited the area where their daughter was last seen.
"There were girls walking home alone, as if her disappearance didn't make a difference," Charlene Spierer said, her voice breaking.
Robert Spierer told Couric he holds on to the slimmest of hope that his daughter might be out there somewhere alive. But he said he's adjusted his adjusted his expectations.
"I understand that Lauren may no longer be with us," he said. "We ache for her. We want to bring her home."
Monday's episode also featured "America's Most Wanted" host John Walsh, whose 6-year-old son was abducted and killed in 1981.
Anyone with information about Spierer's case is asked to call the Bloomington Police Department Tipline at 812-339-4477 or the family's private detective firm, Beau Dietl & Associates, at 800-777-9366.
"The Bloomington Police Department continues to actively investigate the circumstances surrounding the disappearance of Lauren Spierer," Bloomington police said in a statement. "Information received is diligently pursued by the investigators assigned to this case and our commitment to this case is no different today than it was on the day Lauren was reported missing."