respectively submitted kurt nobel bludsworth, aim - an innocent man. every letter. >> reporter: in prison he was a vor ashes reader. by chance he came across a british crime story about a prisoner exonerated by a nofel approach in 1992. >> reporter: science saved you. >> it was. it was d.n.a. >> reporter: bludsworth was the first person in the united states exonerated by d.n.a. testing, which found that despite what witnesses said, kurt did not kill dawn hamilton. >> i was sitting in the cell. i came out of the yard. it was in april. a guard stuck a post-it note - i'll never forget it - saying urgent, call your attorney, urgent. he said "kurt, you're innocent man". >> i though that. when are you going to get me out of here. >> the d.n.a. proofed that bludsworth didn't do it, but another prisoner was the real prisoner. kimberley roughner closely assembled the description with the phoo mann chu moust ash. the county police decline to talk about it. an hour's south his name is a reminder to police and prosecutors about what can go wrong. >> i will tell yo

respectively submitted, kurt nobel bludsworth, a. i. m. - an innocent man. >> reporter: every letter. >> every single letter. >> reporter: he became a reader and came across a crime story about a prisoner exonerated by a novel approach. science saved you. >> it was. in the end it was d.n.a. >> reporter: bludsworth was the first person in the united states exonerated by d.n.a. testing finding that despite what the witnesses said, kurt did not kill dawn hamilton. >> i was sitting in my cell, coming out of the yard. it was end of april. a guard stuck a post it note in my cell and it said urgent, call your attorney, urgent. he said, "kurt, you're innocent, man, you're innocent." >> i know that, when are you going to get me out of here. >> reporter:. d.n.a. evidence proofed that bludsworth didn't do it, but another prisoner was the killer. kimberley more closely resembled the description. kurt's case is one the baltimore city and county police decline to talk about, 21 years after he was exonerated. his name is a reminder to other maryland p