Desperate search for College coed Mollie Tibbetts, pig farmer questioned third time

Frustration and speculation is growing in the mystery of missing Iowa college student Mollie Tibbetts. Nancy Grace continues on the case with her experts, including private investigator Vincent Hill, forensics expert Joseph Scott Morgan, New York psychologist Caryn Stark, and CrimeOnline reporter Leigh Egan. Nancy also hears from listeners on the case. Join Nancy at 7:30 a.m. ET Tuesday for a taping of Crime Stories. Call in an share your theories and questions at 909-49-CRIME.