Disastrous
Tragic, Miserable, Wretched, Pitiful
noun, な adjective
A sad disaster is one that's especially disastrous and tragic. It's the worst kind you can imagine.
ひさん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
残された加害者の家族の末路は、悲惨なものだった。
The assailant’s remaining family member’s last days were tragic.