Prosecutors expect to file criminal charges next week against the daughter of state Assembly finance chairman John Nygren and her fiancee. Twenty-eight-year-old Cassandra Nygren and 33-year-old Shawn Gray were returned to jail on 50-thousand dollar bonds after a Brown County court hearing Thursday. Sheriff’s officials say the two provided prescription fentanyl that killed 31-year-old Jennifer Skeen in June near Green Bay while she was six months’ pregnant — and her unborn baby also died. Cassandra Nygren has long struggled with a drug problem, and her father made it the impetus for about 30 bills he introduced in the past four years to fight opioid and heroin addiction. All were signed into law, including eleven measures earlier this year.