Billy Crystal and his wife, Janice Crystal, along with other close friends, are mourning the sudden death of Rob and Michele Reiner. Following their devastating murders, the couple joined Albert and Kimberly Brooks, Martin Short, Alan and Robin Zweibel, Larry David, Ashley Underwood, Marc Shaiman, Lou Mirabal, Barry and Diana Levinson, Ambassador James Costos, and Michael Smith in releasing an emotional tribute to the Associated Press on Tuesday.