Dr. James "Jim" Mallory is a medical supplier and a con artist, as well as the partner in crime of mobster Cally Lonegan. Mallory and Lonegan sold low-rate and used supplies for inordinate prices, with enough muscle from Lonegan top keep the cons going. Mallory was also a child abuser, targeting girls he would get addicted to drugs to degrade them as he liked.
Cally was suspected of shooting him on a golf course, for two reasons: he cooked the books for more profits than Cally, and he abused Cally's brother Professor Donald Lonegan's daughter, Margaret Sikborsky, resulting in her dying from an overdose. It was really Donald who shot Mallory in revenge. Cally later shot Sierra Leone-born cabbie Sebastian Waziri, as he was a witness to the murder from having driven Donald to and from the scene. Cally took the full rap, and he was later shanked in prison by enemy mobsters. (L&O: "Brother's Keeper")