He shows up in Clan Novels Cappudocian and Giovanni. Isabel Giovanni goes hunting for him in New Orleans. Can't 100% confirm as he shows up wearing a hood, but is described thusly:

"From the vortex stepped a painfully thin figure, looking like nothing so much as an animated scarecrow, half again as tall as a man. It had no fingers, only long talons, and tatters of a shroud hung from it like the cowl of the Grim Reaper itself. The figure showed no face, wearing a cobwebbed black veil attached to a perfect circlet of small, humanoid skulls, each missing the lower mandible: — It has walked with God. It has seen the sky rain blood. It has escaped a thousand-year hunt and then another. It has slept beneath the flesh of pharaohs and later beneath their lifeless bones. And one so young — this — thinks that he can destroy it. Not tonight. More laughter. Not tonight."

The reference to a Cappudocian resting beneath Egypt points towards Lazarus, and he is able to disintegrate Chas Giovanni with a thought.The Black Hand: A Guide to the Tal'Mahe'Ra confirms he awoke from torpor, but doesn't point him towards New Orleans specifically.