. >> he was the first to investigate coast jerry sandusky. could there be a link between that case and his disappearance? >> somebody knows something or a lot of somebodies do. somebo >> hello and welcome to dateline. ray gricar was the first to invest in applications coast jerry sandusky sexually abused the child long before the scandal made headlines. seven years later he mysteriously disappeared. the strange turn of events left people asking was there a connection? here is lester holt with the case of the missing d.a.. >> the clues are tantalizing. a sporty red car. a speck of cigarette ash. battered hard drive. >> it absolutely is a mystery. >> what do those clues say about the sudden disappearance of the district attorney who left them behind? his name is ray gricar. when he vanished in 2005 it was a big story. >> the prosecutor who vanished on friday is still missing. >> and now his story linked to an even bigger one. seven years before he went missing ray gricar decided not to prosecute jerry sandusky for the first known allegation of