to help sort this out, jack snyder, and professor at the college of the holy cross. we have a professor of teacher education and the executive directser of tfa mying walk and teacher of america. you started with tfa in 1999 and working in baltimore and why did you join and what did they intend to do? >> i joined teach for america for a number of reasons, i wanted to be a teacher and i had an education concentration in english for a few years and would have taken me another semester to teach. i had been volunteering in schools in durham and wanted to do more for black children in particular because i felt like black children having been a black child i knew the experience of not being served. so that is why i wanted to join. >> whoo did you think that the purpose was, what was their motivation? >> you know, i was drawn in by the idea of one working to this one day that all children would have access to excellent education and i would be a part of that and i have to say i thought i was joining an organization of like minded individuals and committed to black and brown

jack nelson. he knew melvin snyder personally. and something just didn't add up.iber shell casing was discovered in melvin's barn, and ron harshman purchased a .25-caliber handgun just a few weeks before melvin disappeared. but ron was never able to produce the weapon, saying it had been misplaced. >> there was a lot of information there, but nothing new was coming in to give you the opportunity to do anything more with it. >> nelson pored over the case file and discovered an interesting notation. ron harshman admitted test firing his new .25-caliber pistol in his backyard just after buying it. that gave nelson an idea. >> what about going out there and seeing if we can find a shell casing and then compare that to the one in the barn. >> when mr. nelson originally told me that and i just kind of gave him a look, this was 15 years to try to find a shell casing in grass, and we are not sure of the exact area. but in this case, being the fact that it's murder, i'm willing to try any idea and it was worth a shot to do. >> police found help in nearby gettysburg, pennsy