>> a husband and father is suddenly under suspicion. >> he's trying, or crying. >> three daughters stand by their and one prosecutor stands firm. >> he's holding his wife of almost three decades under the water. my job is to get justice for cristi >> was it murder? âa hello and hello, and welcome to dateline, a young woman peers into her neighbor's yard and sees something for a few mysterious seconds. a man, a woman, and a moment it's unsettling. what's she saw, and what she did would set in motion a chain of events that would divide a family and injury. here is keith morrison. >> we know the truth and we know everything that happened. >> how do we know what we?