If Cesar Laurean PLANNED to kill Maria - he surely would have taken her to an isolated place and disposed of her body. Wife would not have known or could have provided an alibi and there would not have been a barbecue.
However, if Maria’s killing was the result of an angry rage attack - who is the most betrayed and aggrieved party in this triangle?
And the strangest words out of the captured Laurean “I loved her”. Have to wonder what reaction that admission will provoke from Christina?