Katie Couric, Diane Sawyer and Brian Williams host a fund-raiser for cancer research. Stevie Wonder leads a musical number that includes Natasha Bedingfield, Queen Latifah, Martina McBride, Aaron Neville and Dave Stewart.

Mac investigates the shooting of a 14-year-old boy who was gunned down in front of his younger brother.

The SRU team searches for a girl who was kidnapped from her home shortly after she called 911 to report that an intruder was in her house.