The 20-year-old was last seen on June 3. She was walking home alone from a friend's apartment early that morning, a few hours after she left a popular Bloomington bar.
The TV show "America's Most Wanted" aired an episode on Spierer's case over the weekend. The broadcast generated 30 to 40 tips, but so far there have been no major breakthroughs, police say.
Spierer is from Greenburg, N.Y. Several rewards are being offered in the case. Her family says she has a heart condition.