sources tell nbc news that rex tillerson is donald trump's choice for secretary of state. he has a close relation with vladimir putin. and for the first time in 15 years, army beat navy in the heated college football rivalry, ending a 14-game losing streak. president-elect was in attendance for the 117th matchup. now it's back to "dateline extra." welcome back to "dateline extra." i'm tamron hall. charlie tan told police he shot his father to save his mother. but investigators were finding flaws in that story. the ivy league student had been arrested and was facing second degree murder charges. was this an intentional killing or justifiable homicide?