>> i think, like, probably 90% paul. >> but david and susan couldn't really give a reason why paul would want to kill roberto other than they felt paul just had the kind of personality to do something like that, while pete didn't. >> so you don't think peter is capable of actually developing a very sophisticated device to create an explosion? >> i am doubtful of it. i don't know him that well. that well. but i really wouldn't think he could. >> okay. >> and i also think he doesn't have the moxie to do something like that. >> what do you mean, the moxie? >> just the -- the meanness. >> the meanness? >> yeah. >> reporter: but peter had actually threatened roberto, wanted to fight him. and as far as anybody knew, paul had never done anything like that. nevertheless, based on this new information from david and susan moore, detectives asked paul to come in for another meeting. which he did quite willingly.