Robert McGill , Tuesday , was found dead in her cabin on the Carnival Elation on mid-50s . Husband Robert McGill , in mid-50s , charged with murder on the high seas , Carnival says . FBI and Carnival cruise line said domestic dispute Tuesday night led to death .
Shirley McGill , 55 , was found dead in her cabin on the Carnival Elation on Tuesday . Husband Robert McGill , in mid-50s , charged with murder on the high seas , FBI says . FBI and Carnival cruise line said domestic dispute Tuesday night led to death .