Violent Delights (S07E01)

A sixth form student, who has been secretly observing his French teacher, unexpectedly becomes the key witness in her husband's murder case. DCI Taggart, along with newly promoted DC Jackie Reid and DS Jardine, are forced to dig up an entire graveyard after the main suspect, an undertaker, refuses to reveal where he has hidden the dismembered remains. Complicating matters, one of the buried individuals turns out to be Aunt Hettie, Jim’s least favorite relative, who also dies in this episode and was buried by the same undertaker.