A mother has been accused of murdering her five-year-old son with a kettlebell before calling his father to say “we don’t have a son no more.”Cedar Mae Sarten, 43, was charged on Tuesday by detectives in Seattle, Washington with the first-degree murder of her son Robert “Bodhi” Gagner-Sarten. She was charged at a medical facility in Seattle, according to the Fairbanks Police Department.Sarten, who had reportedly been suffering from a mental illness, is accused of attacking her son with a 20-pound kettlebell-style weight, crushing his skull, according to an autopsy.His lifeless body also suffered knife wounds, the autopsy report…