You check out GL #43 for his back-story and then tell me what it is. Gawd you're lazy.
OK, basically, he is the son of a Coast City Mortician and has always had a fascination with death, and is probably a Necrophiliac, when he was a kid, the alien Atrocitus (big red guy, leader of the Red Lanterns) hunted him down because of this 'connection to the black' or something, but Hal and Sinestro saved him, Hand found Atrocitus' weapon and used it to become a super-villain. In GL Rebirth, Hal Spectre burned off his hand, but some aliens gave him it back. Because he can hear the voice of the Black, he killed his whole family and then himself and was resurrected as the first Black Lantern.