Vomiting can happen when realize you have murdered your wife and child.
I did hear that vomit was on the mop but there has been no word that I know of WHO"S vomit it was. My first thought was that he vomited after he killed her..nervous while hurridly trying to clean up and continue on with his premeditation to kill and dispose of her. Only when the time to carry out his plan had arrived..he had a little momentary setback..but got ahold of his sociopathic side and continued on...