COPS IN Indiana believe that a missing doctor is dead and have named her oldest son as a person of interest in the six-month mystery. Ophthalmologist Promila Mehta Paul, M.D. disappeared March 21 and her son Paresh Paul--who lived with her--disappeared at the same time. He was found five days later crossing the border with Mexico back into the USA and detained at San Ysidro, California. He refused to speak with cops and has not yet been arrested or charged.