In 1997 after her episode aired, the murderer, who was being held in a Florida jail on other charges, bragged to another inmate that he did it and that inmate turned him in.
The guy only got 15 years in prison and is now out.........
Here's her story:
http://unsolvedmysteries.wikia.com/wiki/Nancy_Manni
Thanks for the link.
I remember this case and did not know it was solved. At the time there was speculation that the murder victim had come to know to much about the activities of the gangland types that used this school as a front and laundering outfit.