Michelle Serrano, 2nd wife of Dr. Walter Serrano (CEO and founder of Serrano Petrochemicals, an unranked corp) hired the runners to take out James Turing a rogue employee who stole corp secrets and ordered a hit on her family. Turns out the target was actually Walter himself and James, a mysad, conspired with Michelle to assume Walter's identity and altered SIN records. They did it to take over Walter's company. Gilgamesh refused to kill an innocent man but Tamp and Smogg killed Walter anyway. Gilgamesh refused to take the blood money
Things of Note
Gilgamesh didnt get any nuyen. He instead got 11 karma and 1 street cred.