During the conversation between Hawke and Harimann when they first meet, Hawke has the choice to kill the lord or to listen to him. If he chooses so, he learns that Harimann was the chief proponent behind sending help to Ferelden during the Blight. Hawke can then decide a course of action and report back to Meeran after complying or disobeying.
If Harimann was spared, Hawke can convince Meeran that Harimann escaped, in which case Meeran will swear to kill him personally. Alternatively, Hawke can come clean, in which case Meeran will swear to kill Harimann himself, but also ambush Hawke at night in Lowtown.Lord Harimann died at some point prior to 9:34 Dragon, either because of Hawke or under unknown circumstances and leadership of the family passed to his daughter, Lady Johane Harimann.