Hollywood is mourning the loss of Presley Gerber, the son of supermodel Cindy Crawford and businessman Rande Gerber. The 27-year-old died Sunday at a rehab facility, according to the LA County medical examiner. Gerber, who had followed in his famous mother’s footsteps working as a model since he was a teenager, was also very open in recent years about his difficult struggles with mental health issues and substance abuse. NBC’s Liz Kreutz reports for TODAY.