the defense in the daniel willyam murder trial had presented their case. than was the more likely killer. he had the motive, they claimed, and a collection of weapons. daniel did not testify in his own defense, but he did speak to us, and he made a blockbuster accusation. with the conclusion of our story here's keith morrison. >>> reporter: daniel willyam, on trial for murdering shelly nance, has a complaint about the way the world is. though he didn't testify, he wanted us to know something about him. and his concern that people -- young people especially -- lack courtesy. they're just too rude. like, for example, the young people he lived with at the art institute of dallas. >> what i was trying to do is be courteous to the people that lives around you. >> it's a lot of discourtesy expressed by these kids? [ daniel laughs ] that's been a problem. >> that is. >> i mean, you see that everywhere? >> yes. >> i mean, people don't have right attitudes about respect and doing the right thing and -- >> manners and courtesy, yes. >> manners and courtesy? >> yes. >

>> reporter: but was daniel willyam capable of so brutal a murder of someone he barely knew? to make up their minds without hearing a word from daniel. though when we spoke with him, daniel had a great deal to say about the case against him. >> now i'm not trying to accuse nathan of murder, i'm just trying to -- trying to find out where was he. but i do have a suspect. >> reporter: oh. >> coming up, just who is daniel talking about? someone the police never even looked at. >> he put the baggie in the bathroom? >> no, i'm saying he had access to my house. >> reporter: when dateline continues. >>> reporter: daniel willyam, on trial for murdering shelly nance, has a complaint about the way the world is. though he didn't testify, he wanted us to know something about him. and his concern that people -- young people especially -- lack courtesy. they're just too rude. like, for example, the young people he lived with at the art institute of dallas. >> what i was trying to do is be courteous to the people that lives around you. >> it's a lot of discourtesy expressed by these kids? [