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Jean Hagen left because she often clashed with Danny, and was not satisfied with her role.
Yes, twice, first wife Amy, second wife Melissa.
Captain Keller's first wife died.
Danny is divorced in the remade series Hawaii Five 0. She has only been in a few episodes of season 2 where we find out she remarried.
Danny gaither's wife (at the time of his death) was Yvonne (or Vonnie)
She Died
John Danny Olivas' wife is named Rachael. They got married in 1991.
Ronnie Booth's first wife passed away in 2016 after battling cancer.
He upgraded to a Russian wife who was out to take him for all she could.
Hernandowife was killed.
she was given to another man
Babe Ruth's first wife, Helen Woodford, died in a fire years after they had been separated.