MSNBC Dateline Extra September 23, 2019 04:06:00
>> we heard that was the first time shannon realized that they were engaged. >> reporter: shannon's family says the d.a. and the detective heard wrong. >> the day that -- that you're referring to, the church, shannon wasn't there. we were there. >> reporter: less than two weeks later, denita smith would still be wearing that engagement ring, as she lay dead at the bottom of her apartment steps. now, just as assistant district attorney david saacks thought he had wrapped up his investigation and was preparing to prosecute shannon crawley for denita's murder, he got word from her attorney. shann...