san kle h own apartment. >> reporter: fueling a national conversation about race, police transparencynd one officer's deadly use of force. >> no justice, no peace! >> reporter: last september, amber guyger who had been a police officer for 4 years was coming home. she lived in apartment 1378 on the third floor. right above her was botham jean's apartment. he was described by friends and family as a ray of sunshine. >> botham had a ray of love for everything and everyone. so i want the message of love to permeate throughout this entire process. >> reporter: jean was an accountant and an active member of the church of christ. ♪ >> reporter: that fateful night he was at home, watching tv and eating ice cream. >> so help you god? >> today was a huge day, not frequently do we see defendants take the stan to testifd to tes. >> reporter: called to the witness stand, geiger testified she accidentally parked on the fourth floor and walked in. when she got to the door, she says she put the key in and it just opened. at that point she heard someone inside. >> i moving around upside inside my apa