Authorities in Tyngsborough have discovered human remains buried under a garage floor, believed to belong to Jill Kloppenburg, a woman from Massachusetts who has been missing since January. The remains were found following a tip from New Hampshire, leading to the arrest of Shawn Sullivan, who faces murder charges. Middlesex District Attorney Marian Ryan confirmed that the remains are likely those of Kloppenburg, and an investigation is ongoing. Sullivan is expected to be arraigned soon as officials continue to piece together the circumstances surrounding this tragic case.