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>> tom kolman had been found dead in his car, with his shirt loosened and his belt buckle undone. at the time, investigators didn't give his appearance much thought, but almost a year later, it became crucial to the case. >> we got a dna report back from the lab that indicated there was an unknown male's dna on the inside of the belt flap of mr. kolman near the belt buckle. >> did you test this dna against gilberto nunez? >> yes. it was -- >> was there a match? >> not -- it was not his. >> no match? >> no match. >> where do you go from there? i mean, that is a -- >> that's a show-stopper. noth...

Thought, but almost a year later, it became crucial to the case. >> we got a dna report back from the lab that indicated there was an unknown male's dna on the inside of the belt flap of mr. kolman near the belt buckle. >> reporter: did you test this dna against gilberto nunez? >> yes. it was -- >> reporter: was there a match? >> not -- it was not his. >> reporter: no match? >> no match. >> reporter: where do you go from there? i mean, that is a -- >> that's a show-stopper. nothing moves in this investigation unless we can determine who that is. >> an unknown john doe. and that's a problem for...

Responding law enforcement. now back to "dateline." responding law enforcement now back to "dateline. >> reporter: tom kolman had been found dead in his car, with his shirt loosened and his belt buckle undone. at the time, investigators didn't give his appearance much thought, but almost a year later, it became crucial to the case. >> we got a dna report back from the lab that indicated there was an unknown male's dna on the inside of the belt flap of mr. kolman near the belt buckle. >> reporter: did you test this dna against gilberto nunez? >> yes. >> reporter: was there a match? >> not -- it...

>> reporter: tom kolman had been found dead in his car, with his shirt loosened and his belt buckle undone. at the time, investigators didn't give his appearance much thought, but almost a year later, it became crucial to the case. >> we got a dna report back from the lab that indicated there was an unknown male's dna on the inside of the belt flap of mr. kolman near the belt buckle. >> reporter: did you test this dna against gilberto nunez? >> yes. it was -- >> reporter: was there a match? >> not -- it was not his. >> reporter: no match? >> no match. >> reporter: where do you go from there? i...

>> reporter: tom kolman had been found dead in his car, with his shirt loosened and his belt buckle undone. at the time, investigators didn't give his appearance much thought, but almost a year later, it became crucial to the case. >> we got a dna report back from the lab that indicated there was an unknown male's dna on the inside of the belt flap of mr. kolman near the belt buckle. >> reporter: did you test this dna against gilberto nunez? >> yes. it was -- >> reporter: was there a match? >> not -- it was not his. >> reporter: no match? >> no match. >> reporter: where do you go from there? i...