He is the last person known to have seen the 20-year-old co-ed from New York, who had spent the evening partying hard with pals. And there has also been some suggestion the petite fashion merchandising student may have been hammering cocaine, OD'd and panicked pals hid her body.
A police source said:"It's very disappointing we have this life and death investigation and this guy isn't saying a thing."
Rosenbaum, 21, along with Lauren's boyfreind. Jesse Wolff, are
described by detectives as "persons of interest." Rosenbaum has already hired a high-powered defence attorney and left Bloomington.
But his lawyer scoffed that he wasn't cooperating: "He has provided full statements to the police and passed a polygraph that has also been provided to the authorities. Mr. Rosenbaum hopes for nothing less than Lauren to be found and to be safe."
Lauren's mom , Charlene Spierer, sobbed last week the family is frustrated and angry by the lack of help from the young woman's friends.
She said: "What I can tell you is that I am extremely disappointed by the fact that only one of Lauren's friends have called the Bloomington Police Department with any information."