Admiral Rael'Zorah

Rael'Zorah is Tali's father and member of the Admiralty Board.

Mass Effect 2
During the events of Mass Effect 2, Rael'Zorah told Tali to send him parts and pieces for a seceret project on the Alarei. Eventually, the geth he made attacked both him and the other quarians, and Tali faced treason and exile. After going in the Alarei, Tali finds Rael'Zorah's corpse. On the bridge, they find evidence that shows what Rael'Zorah was doind. If Shepard shows this to the Admiralty Board, Rael'Zorah's name gets stripped from every ship he served on, and probably would be depicated as a monster in a cautionary tale for children.