No, no, no...let's not twist CW's self serving statement, to TRY and make it truthful.
He was asked, by the police, who were doing the initial investigation - ' did you see your children that morning, before you left for work.'
his reply was that he saw them on the monitor only, as he left very early.
THAT^^^^ WAS A LIE.
The officer was not asking him 'did you see your children's dead bodies on the child monitor before you disposed of them? '
He was asking CW if he saw his family, safe and sound, when he left for work. And he lied in response.