sementilli was the one that kind of orchestrated things. >> on january 23rd of 2017, fabio sementillio school. >> we learned from prosecutors that fabio was out on the back patio by the pool in his favorite chair. the housekeeper is just about to leave. it's around 2:00 or 2:30. >> and when she leaves the home, it's spotless. >> gessica and monica come home, and then a short time later gessica leaves for a babysitting job, and then around 3:26 monica heads out for target. >> she arrives at 3:30, proceeds not to park in front of the target, but goes toward the side of the building where, on security tape you can see a figure getting into the passenger side. then she drives further around the back and no one really sees that person get back out of the car. however, they do see her start driving back around, parks in the front, enters the target at 3:38. >> prosecutors alluding this is how she's beginning to build her alibi. >> reporter: police who retrieve the target surveillance footage say that it shows monica checking her phone while inside the store. and pulled phone records police