>> reporter: police expected zimmerman was armed after receiving this frantic call from his estranged wife, shellie zimmerman. >> he's in his car. he keeps saying step closer, he's threatening all of us. >> step closer and what. >> and he's going to shoot us. >> reporter: police say they did not find a gun. >> get on your knees. cross your feet. >> reporter: according to police, there was a confrontation at the home the zimmermans once shared, a home owned by shellie's father, david dean. >> he accosted my father and then took my ipad out of my hands and smashed and cut it with a pocket knife. >> reporter: this was dean after the attack. police say zimmerman was using the now smashed ipad to record video of what was being taken from the home. in this home surveillance video, footage george zimmerman volunteered to officers, you can see george smash the ipad. now that ipad is at the center of the investigation.