Jealous appears only in a flashback where Rem explains a method to kill a Shinigami. In this flashback, Rem recalls Jealous watching over a woman in the human world. Surprised by his concern, Rem eventually looks over his shoulder and witnesses what should have been the woman's last moments on Earth. In a dark alley, a distraught man mistakes the woman for the one who broke up with him and attempts to stab her to death. Apparently infatuated with the woman, Jealous uses his Death Note to kill her destined murderer; the man suddenly walks away to commit suicide. Moments later, Jealous himself turns into a pile of sand and rust as a consequence of extending a human life. Rem takes his Death Note and gives it to Misa.
Jealous' name is commonly misspelled "Gelus," which was the romanized spelling until Death Note: How to Read 13 revealed the official spelling as Jealous. The first through fourth printings of Volume 4 of the English-language manga refer to him as Gelus.
Ken'ichi Matsuyama, who portrayed L in the live-action films, voices Jealous in the anime.
