"Sworn to Vengeance" is an adequate TV movie from 1993 based on a real incident in Texas, which was the subject of a book. It stars Robert Conrad, William McNamara, Peter Breck, and Sharon Farrell.
When three teens are brutally murdered, Sergeant Stewart (Conrad) is so shaken that he goes to each body and promises to find their killer or killers. A woman (Farrell) had a vision of the murders as they were happening and is able to give clues to the killers' identity; this is dismissed by the detectives in charge, but not by Stewart.
Stewart has trouble staying on the case, thanks to problems with the other jurisdiction that felt he had stolen another case from them. Though his boss (Breck) assigns the case to him, he is later removed. He resigns and starts to work at the jail where one of the suspects (McNamara) is imprisoned for another offense. Stewart knows right away that he is one of the killers and attempts to get him to confess.
I've been told the book is amazing; this is less than amazing, but it was great to see Sharon Farrell and Peter Breck -- I hadn't seen either one of them in years. Robert Conrad is fine as the determined Sgt. Stewart.
The story, which is an interesting one, could have been more compelling, but it's a TV film after all. A very tragic case about needless killings and the monsters who did it.