Leo Castelli, 91, one of the world's most influential art dealers (he fostered the careers of such painters as Andy Warhol, Robert Rauschenberg and Jasper Johns), Sunday in New York, following a short illness . . . Bobby Sheehan, 31, bass player for Blues Traveler, at his home in New Orleans, Friday, of an undisclosed cause (results of an autopsy are pending) . . . Rosie Jacuzzi, 95, the oldest member of the Jacuzzi family (which invented the Jacuzzi whirlpool) and a survivor of the 1906 San Francisco earthquake (which claimed her mother and brother), Aug. 4, in Walnut Creek, Calif.