Accused murderer who allegedly killed mother at sea for inheritance found dead while awaiting trial

Man pleads not guilty but prosecutor claims he killed both mother and grandfather for family money
Nathan Carman discovered floating in life raft eight days after boat sank during fishing trip with mother
Carman charged with fraud for insurance claim on sunken boat and first-degree murder of mother
Relatives say death leaves them saddened but without closure on Carman's alleged crimes
Federal case dismissed following Carman's unexplained death in jail cell awaiting trial in October