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Had to consider -- the perpetrator may have been someone julie knew. >> you're not ruling anyone out or in. you're simply going through the motions. you're speaking to immediate family first, and working your way out. >> reporter: the sheriff's department did not tell the griffiths julie had been murdered. >> we were not told anything by the police at that point. >> reporter: but anyone at the scene might have guessed foul play was somehow involved. >> there was just cops all over the property. >> reporter: so you said, "why are the cops here?" >> exactly. yep. >> reporter: naturally, the firs...

Perceived was the cause of the inferno: an accidental fire set off by a newly installed heating unit. >> you had a new gas pack put in tuesday? >> mmm hmm. >> okay. >> i mean it was a whole new system. >> reporter: keith explained the contractor was a friend of his who'd done the work just a few days earlier. >> they put a rush on it. i mean, you know, that's kind of what friends do for each other. >> okay. >> and i hope to god that this problem is not his. >> reporter: but eventually, without giving details, the detective revealed julie's death was no accident. >> the investigation's showing ...