John Edward Robinson, 56, would search the Internet under the screen name slavemaster for sadomasochistic sex partners and possible victims.  He was charged with murdering five women and stuffing their bodies into barrels.  It is believed that he is responsible for the killing of at least 11 women.  He was already in jail in lieu of $5 million bail on charges of sexually abusing two women he met online when the murder charges were announced.  Prosecutors are seeking the death penalty.