Further investigation reveals that Darheel was away from Galitep on the day of the accident which infected his workers and prisoners, and as Dukat tells Sisko, Darheel is dead-half of Cardassia attended his funeral.
Darheel was away from Galitep on the day of the accident. This is what further investigation reveals. This accident infected his workers and prisoners. Darheel is dead. Dukat tells Sisko. Half of Cardassia attended his funeral.