Seattle ? A woman and her boyfriend pleaded not guilty Thursday to murdering six of her family members on Christmas Eve.

Prosecutors are deciding whether to seek the death penalty if the suspects, Michele K. Anderson and Joseph Thomas McEnroe, both 29, are convicted.

Investigators have said Anderson and McEnroe confessed to shooting her parents, her brother and his wife and that couple’s two young children at her parents’ home near Carnation, east of Seattle.

Prosecutors have given no motive, but said Anderson told detectives her brother owed her money and that she was upset because her parents did not take her side. She also said her parents were pressuring her to start paying rent for staying on their rural property.