NEW BEDFORD — A prosecutors' office says it will ask the trial court to impose the jail sentence for a woman convicted of involuntary manslaughter for encouraging her boyfriend to kill himself.

Bristol County District Attorney Spokesman Gregg Miliote says the office will file a motion in the coming days asking the court to impose the 15-month sentence for Michelle Carter.

The 22-year-old has remained free while she pursues her appeals. Massachusetts highest court upheld her involuntary manslaughter conviction on Wednesday.

Carter's lawyers said they will consider all legal options, including an appeal to the U.S. Supreme Court. They said they continue to believe she is not responsible for the July 2014 death of Conrad Roy III.

The trial judge found Carter caused Roy's death when she instructed him to get back in a truck filled with carbon monoxide.