St. Paul resident Sara Jane Olson and three other members of the Symbionese Liberation Army will be arraigned in Sacramento tomorrow on charges of first degree murder. Federal officials yesterday arrested Olson, Emily and Bill Harris, and Michael Bortin for murdering Myrnal Opsahl during a bank robbery in Carmichael, California in 1975. Before tomorrow's hearing in Sacramento, Olson will be sentenced in Los Angeles for her role in a failed attempt to blow up L-A police cars in 1975. Court documents filed yesterday include an interview Patty Hearst gave the F-B-I in 1976 detailing her version of the robbery. Hearst has admitted participating in the heist and was granted immunity in the case. Sam Stanton has been following the story for the Sacramento Bee. He says in the court documents Patty Hearst claims Emily Harris shot Myrna Opsahl: