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>> he was acting like he was crying, but i didn't see normal stuff when you cry. >> in the days that followed kathy's death, investigators tested and retested the water heater and other appliances. prosecutors reminded the jury, there was no sign that any appliance had accidentally released carbon monoxide. that was the crux of the case. >> it either had to be the hot water heater, or was murder. that's the bottom line. >> if it was murder, how would you done it? prosecutors believe that mark wrangler closed all the heating vents, except for the one in kathy's room. then, he must of shut the d...

Out events in kathy's room. they pointed to pictures taken of kathy's room after she died. >> can you tell the jury of anything you notice in the bedroom? >> i observed a suit like marking on the wall, directly above the register. >> nobody actually tested that stain on the wall before it was painted over, but prosecutors were prepared to show that engine exhaust had come through the heating ducts, and out events. prosecutors now presented the key scientific evidence, designed to wipe out any remaining doubt about the source of the carbon monoxide. live cam in his head tested the -- and said t...