Now Playing: Be the Change: Save a Life

Now Playing: How Michelle Obama reacted to Donald Trump winning the presidency: Part 4

Now Playing: Michelle Obama reflects on what she wants her legacy to be: Part 6

Now Playing: From Michelle Obama's humble Chicago upbringing to the White House: Part 1

Now Playing: Michelle Obama surprises students in a dance class at her former high school: Part 5

Now Playing: Michelle Obama opens up about miscarriage, IVF and marriage counseling: Part 2

Now Playing: Michelle Obama on the bruising campaign to the White House: Part 3

Now Playing: 7-year-old daughter becomes key eyewitness in attack on mom: Part 3

Now Playing: Manhunt begins for brutal killer of mother of two: Part 2

Now Playing: Man tells police he was hired by husband to kill wife for $10,000: Part 4

Now Playing: Former hockey player found guilty in murder of his wife: Part 6

Now Playing: Former hockey star's young family shattered by wife's murder at home: Part 1

Now Playing: Investigators build case against husband in his wife's brutal murder: Part 5

Now Playing: Michelle Obama surprises students at former high school, room erupts with joy

Now Playing: Woman abandoned at birth learns her biological mom hid multiple pregnancies: Part 4

Now Playing: Woman meets biological sister for first time, finds another long-lost sibling: Part 6

Now Playing: Man abandoned at birth calls woman he believes might be his mother or aunt: Part 5

Now Playing: Adults abandoned at birth meet biological family members for the first time: Part 3

Now Playing: Abandoned as babies, adults find clues in search for birth parents: Part 2

Now Playing: Adults abandoned at birth turn to genetic genealogy to find biological family: Part 1