One source:
http://www.citizensvoice.com/news/remembering_mary_jo_a_promising_life_lost_at_chappaquiddick_40_years_ago


A Google search turns up numerous references to the insurance payment, personal payment and that Kennedy paid the Kopechne's legal fees for fighting the exhumation of the body for a second autopsy. None of this IMHO is at all damning to Kennedy. It is the least he could have done.