While millionaire Robert Durst awaits extradition from Louisiana to California in the death of Susan Berman, the FBI has asked authorities in New York, Vermont and California to review their cold case files for possible links to the wealthy suspect.FBI director James Comey was in Houston on Thursday and talked about the Durst case, according to KTRK-TV . Comey said his agency is already helping in cold case investigations in California, along with cases in New York and Vermont."I know that we are doing a number of things in different field offices to run down leads," said Comey. "That is one of the powers of the FBI. We're everywhere in the United States."Durst, 71, remains in a mental health unit of a Louisiana jail awaiting extradition and still could have gun and drug-related charges brought in New Orleans before he is ever moved to California, authorities told KTRK-TV. He is wanted in California for the 2000 Los Angeles murder of Berman. The Los Angeles Times reported that a second California case possibly involving Durst centers around the 1997 disappearance of teenager Karen Mitchell from Eureka.Eureka police Capt. Steve Watson did not identify Durst as either a suspect or person of interest in the cold case but authorities there told the Times on Tuesday they want to know if Durst has information on the disappearance.In New York, prosecutors are taking another look at the disappearance of Durst's first wife Kathleen, who has not been seen since 1982. Before Kathleen Durst's disappearance, a friend said she had confided that she wanted to divorce Robert Durst but was afraid of what he might do, noted the Times.Authorities believe that Berman, who had known Durst since the two attended UCLA together and acted as his informal spokesman after his wife's disappearance, was killed to keep her from talking to the police, said the Times.HBO's six-part documentary "The Jinx: The Life and Deaths of Robert Durst" renewed interest in Durst and the cases he has been connected with, and led to his arrest. The documentary's director Andrew Jarecki toldthat he had hoped Durst would have been arrested after the series ran given what the show uncovered.