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Scott J. Johnson of Kingsford, Mich., had been charged with three counts of first-degree intentional homicide. Internet court records say he is now also charged with six counts of attempted first-degree intentional homicide and one count of second-degree sexual assault.
His attorney, Len Kachinsky, says he expected at least some of the additional charges to be filed.
The 38-year-old is to enter a plea this afternoon and Kachinsky says he may plead insanity.
Prosecutors say Johnson went to the Menominee River on July 31 and opened fire on a group of swimmers, killing three and injuring one. Investigators say he fired about 17 shots.
