Pics:Bobbi Kristina Brown once tried to stab mother Whitney Houston

The incident occurred when Kristina Brown was all of 14, Halperin has said in a new TV series "Autopsy: The Last Hours of Bobbi Kristina Brown", reports radaronline.com. After trying to kill her mother, Kristina Brown slit her own wrist which led her into hospitalisation back in 2008. "She knew her mother was a ticking time bomb because of all the drugs, all of the emotional fragility," Halperin said on the special show."She would try not to go against her, although there were a couple of times when violence broke out. She once tried to stab her mother," he added.