If it weren't for the murder of K'elyhr it wouldn't have made sense for Worf to kill Duras.
It does seem odd that Duras thought he could get away with it. The way the computer can track everybody's life signs all the time it's a wonder there isn't some kind of emergency system to transport somebody automatically to sickbay and put them in stasis whenever it detects they're on the verge of death.
Maybe Duras just figured he had diplomatic immunity so as long as he got off the ship before anyone found her there's nothing they could do.
It does seem odd that Duras thought he could get away with it. The way the computer can track everybody's life signs all the time it's a wonder there isn't some kind of emergency system to transport somebody automatically to sickbay and put them in stasis whenever it detects they're on the verge of death.
Maybe Duras just figured he had diplomatic immunity so as long as he got off the ship before anyone found her there's nothing they could do.