YOU SAID:
Jonas was sad with the death of Fiona.
INTO JAPANESE
ジョナスはフィオナの死に悲しみました。
BACK INTO ENGLISH
Jonas was saddened by Fiona's death.
INTO JAPANESE
ジョナスはフィオナの死を悲しんだ。
BACK INTO ENGLISH
Jonas mourned Fiona's death.
INTO JAPANESE
ジョナスはフィオナの死を悼んだ。
BACK INTO ENGLISH
Jonas mourned Fiona's death.
That didn't even make that much sense in English.