What is Matthew Farwell accused of in relation to Sandra Birchmore?

Matthew Farwell, a former Massachusetts police officer, is accused of grooming Sandra Birchmore starting when she was only 13 years old, engaging in a sexual relationship with her when she was underage, and ultimately getting her pregnant before murdering her and staging her death as a suicide. The case has recently been in federal court where Farwell faces federal murder charges in connection with the death of his pregnant girlfriend. According to court proceedings, the trial date may be approaching soon as the prosecution builds its case around the disturbing allegations of long-term abuse that culminated in Sandra's death.