12/11/2010 05:12 am ET Updated May 25, 2011

Audio Expert Examines New Evidence In Kent State Shooting

Four decades have passed since Guardsmen killed students in the Prentice Hall parking lot.

The reason they fired has never been revealed, clouded by conflicting accounts and the haze of all those years. But the results of an audio analysis released Friday have already inspired some to seek answers, even prompting a congressional inquiry.

Shots were apparently fired prior to the Guard's shooting, and claims of an order to fire seem more substantiated than ever. After 40 years, there's new evidence and the chance of closure for the victims and witnesses of the May 4 shooting.