by senseless violence. >> reporter: this morning tears and heart break for the victims as police scour through the suspects' lives to search for a motive to the crime. there's no true way to know what the true intent was. again, a big part of the place is the digital footprint, the fbi doing all they can to retrieve as much information as possible. >> miguel almaguer, thank you. one of the biggest mysteries, who exactly was tashfeen malik and what drove her to gun down more than a dozen people and leave behind her infant daughter? nbc's stephanie gosk is at the home in redlands, california. what are we learning about her today? >> reporter: hey, alex, good morning to you. well, tashfeen malik went through a rigorous process to get into the country on the k-1 or fiancee visa. and then she applied for a green