Karen Read is off the hook for the death of her cop boyfriend, John O'Keefe ... but she's not done fighting the system that put her through hell. She sat down with the "Today" Friday to explain why she's suing the police departments working the case, saying it was always her plan to file a lawsuit after first defending herself in court. Karen explains ... "I have to continue fighting for justice. The acquittal is deserved, but the wrongs have not been completely righted." She says her goal is