Now Playing: Former Oklahoma City Police Officer Daniel Holtzclaw Guilty of Raping 8 Women

Now Playing: Justice for Granny: Oklahoma Ex-Cop Gets Life in Prison

Now Playing: Jordan Brown recalls arrest at age 11 for murder: 'I had no idea what was going on'

Now Playing: Being Melania - The First Lady Part 1: Melania Trump on becoming the first lady

Now Playing: Being Melania - The First Lady Part 2: Melania Trump on her husband's tweets

Now Playing: Being Melania - The First Lady Part 3: Melania Trump on immigration, 'the jacket'

Now Playing: Being Melania - The First Lady Part 4: Melania Trump on the #MeToo movement

Now Playing: Being Melania - The First Lady Part 5: Melania Trump on distrust in the West Wing

Now Playing: Being Melania - The First Lady Part 6: Melania Trump on the state of her marriage

Now Playing: Audio detailing the night Prince nearly died from overdose on plane: Part 1

Now Playing: Teacher's gruesome 1992 death launches decades-long mystery: Part 1

Now Playing: Pennsylvania teacher's 1992 death grows cold: Part 2

Now Playing: Genetic genealogist breaks open 1992 cold case in 'a couple of days': Part 3

Now Playing: Police announce wedding DJ as suspect in 1992 cold case killing: Part 4

Now Playing: Ex-girlfriend of DJ charged in teacher killing says she 'can't believe it': Part 5

Now Playing: Brother of slain teacher meets genealogist who broke open cold case: Part 6

Now Playing: How this DNA detective went from finding families to fighting crime

Now Playing: How genetic genealogist CeCe Moore identified potential suspect in 1992 cold case

Now Playing: Former girlfriend speaks out on arrest of man in 1992 cold case

Now Playing: Brother recalls learning of arrest in slain sister's cold case