Gotham is no stranger to killing off characters, even though some of them have the tendency to come back from the dead. Still, there are some characters whose deaths still manage to be absolutely shocking, and one went down in “Ruin.” In his first appearance of Season 5 and only the fourth episode, Jeremiah Valeska -- looking more Joker-esque than ever -- was killed by none other than Selina Kyle, and the door may now be open for the Gotham version of The Joker to develop.