>> he was the first to investigate coach jerry sandusky? could there be a link between that case and his disappearance? where is this man. >> somebody knows something or a lot of somebodies do. >>> hello, and welcome to dateline. ray gricar was district attorney in bellefonte, pennsylvania. he was the first to investigate allegations that coach jerry sandusky sexually abused a child. that was long before the scandal made headlines. seven years later, ray mysteriously disappeared. the strange turn of events left people asking, was there a connection? here is lester holt with the case of the missing da. >>> the clues are tantalizing. a sporty red car. a speck of cigarette ash. a battered hard drive. >> it is a mystery. it absolutely is a mystery. >> what a the clues of the sudden disappearance of the district attorney who left them behind? >> it is baffling. it is confusing. it's perplexing. >> his name is ray gricar and when he vanished in 2005, it was a big story. >> the prosecutor who vanished on friday is still missing. >> now, his story

over the years because they investigated the sexual abuse by former penn state football coach jerry sanduskye police put that together. to give you a sense of their skills. at this point, this is what is believed to be a significant development. not confirmed it's the suspect. it does appear that they have at least gotten their first break. whether it pans out in an arrest we will find out. >> the breaking news right now, police are questioning a man in pennsylvania in part because he was found with a gun similar to the one used in the shooting. i'm curious your thoughts in terms of what types of questions law enforcement would ask this person. what are your questions this morning knowing what we have in terms of evidence and clues that have been gathered to this point? >> over the weekend, the only real thing that we saw develop was two extra photos come out in new york city from the taxicab and by the port authority. like i said a few minutes ago, the way in which the pennsylvania police most likely were able to find this person of interest was through a phone call, through a tip. i haven'