Two brothers arrested after a fatal shootout with a law officer received immunity from prosecution in 1982 for testifying against convicted spy Christopher Boyce on conspiracy and bank robbery charges.

James and Joseph Pratt were arrested Thursday after a 22-hour manhunt that began with a botched house robbery and ended after the death of U.S. Forest Service law officer Brent Jacobson in woods near this north Idaho town.Joseph Pratt, 27, was arraigned Friday on charges of first-degree murder, two counts of attempted first-degree murder, first-degree burglary, robbery, two counts of second-degree kidnapping, and two counts of aggravated assault. He was being held without bond in the Bonner County Jail.

James Pratt, 29, was wounded in the left leg during the shootout and was under guard Friday at Bonner General Hospital. His arraignment on the same charges was set for Monday.

Boyce was convicted in 1977 of selling CIA satellite information to the Soviet Union and sentenced to 40 years, but he escaped from a California prison in 1980 and remained at large 19 months, living in rural northern Idaho.