Task: Question Answering
Input (English): Passage: After booking a boat trip to attend a rave to an island located off the coast of Seattle named "Isla del Morte" ("Island of Death"), two college students, Simon and Greg meet up with three girls: Alicia, Karma and Cynthia. Karma has a crush on Simon, Simon has a crush on Alicia, and Cynthia is Greg's girlfriend. When the five arrive at the dock, they find that they are late and the boat that is supposed to take them to Isla del Morte has already left. A boat captain named Victor Kirk and his first mate Salish offer them a ride on their boat, the Lazarus V (named after the biblical man raised from the dead). As they leave, a policewoman named Jordan Casper tries to stop them from leaving, knowing of Kirk's past as a smuggler, but fails.
Arriving at Isla del Morte, they find the rave site messed up and deserted. Alicia, Karma and Simon leave the site to go find anybody around while Cynthia and Greg stay behind. As Greg and Cynthia are about to make out in a tent, the former leaves to urinate. Alone in the tent, Cynthia is killed by a group of zombies. Meanwhile, Alicia, Karma and Simon find a derelict house and as they attempt to investigate the place, they discover Rudy, Liberty and Hugh, who inform them of a zombie attack during the rave. Alicia and Rudy used to date and Liberty was a dancer at the rave. The six leave the house to fetch Greg and Cynthia. Meanwhile, the zombies kill Salish when he is alone in the forest. 
Question: Who used to date one of the three girls who rode on Kirk's boat?
Output (English): Rudy.