>> my name is lars itzo. ah, man. >> what do you make of this tone from lars? upset about what he's just done. >> i thought he was havin' more of an aw shucks moment, as opposed to an oh my god moment, "i just shot my wife." >> reporter: but within moments, lars became frantic. >> oh! baby! >> reporter: hyperventilating, lars itzo, recorded -- moaning -- >> reporter: the question, was it for real? >> the way he switched up emotions from when he starts doin' cpr it sounded a lot like mouth breathing. >> to me, it sounded like overacting. >> reporter: and investigators also noticed how lars's story evolved over just a few hours, on the 911 call he set the scene this way. >> i seen a light, a flashlight or something i didn't know what it was. i just seen a light and i heard movement. i thought she was right next to me when i got up out of bed. >> reporter: to responding officers, he changed the order of events -- telling them he saw that light after he got out of bed. >> i got to the door i seen a flash of light coming from the front of the house. >> reporter: and