CNN sources: Medical report by George Zimmerman's family doctor allegedly shows he suffered a broken nose, two black eyes and two lacerations to the back of his head after he shot & killed Trayvon Martin. What will this mean for his defense?

HLN's Nancy Grace investigates Whitney Houston's death and asks what caused the tragic death of singing legend Whitney Houston.
Whitney Houston 1963 – 2012
Beverly Hills Police: Not a criminal case
Just a friend? Ray J and Whitney
What happened the day Whitney died?
Here it is: Whitney's last performance
Jane Velez-Mitchell: We didn't do enough
What about Bobbi Kristina Brown?
All this week, stay tuned to HLN’s “Nancy Grace” at 8PM ET, live from Hollywood, for up-to-the-minute details surrounding Houston's death.

