密室 みっしつ殺人 さつじんじゃなかったです
misshitsusatsujinjanakattadesu

Noun
Desu Copula

The polite, past negative form of 密室殺人

1. Wasn't a locked-room murder.; Wasn't a murder in a closed room.

Past/Perfective
Negative
Polite
Casual Register