By CBS Miami TeamMIAMI - The family of Knaus Berry Farm owner Rachel Knaus Grafes announced Saturday on social media that she had succumbed to her injuries after authorities say she was attacked by her son. Rachel was airlifted to the hospital after the attack where she remained in critical condition until she died. "Back in 2013, he was arrested and charged with assault, burglary, and possession of a firebomb, but those charges were ultimately dropped because he was found to be mentally incompetent