Gets killed by Dragon while drugging him (original film)
Comes back from the death while Cyrus wished that he Never Died in the Hands of Dragon the Cat! (sequel)
Comes back from the death while Joseph wished that he Never Died in the Hands of Jenner either! (An American Secret of NIMH IV)
Jonathan Brisby is the late husband of Mrs. Brisby in The Secret of NIMH. He was the bravest of all the street rats and mice. It is said that without his bravery, none of the rodents would have survived the escape through the ventilation system. Alas, he couldn't save himself from getting killed by the farmer's cat Dragon while drugging him.