TV Guide Investigation Discovery Sunday

After a friend and holiday resort co-worker went missing on a desolate mountain, detectives had to sort through a list of tight-knit colleagues with potential motives for murder. One of them proved to have crucial information that would lead to a killer among them

Close-knit co-workers are devastated when one of their own is found dead near a soccer pitch at the edge of their quiet Indiana town. Investigators considered whether this murder was a random act of violence

Buying goods from the comfort of home

Buying goods from the comfort of home

Buying goods from the comfort of home

Buying goods from the comfort of home

When a father of three was shot dead in a devastating hail of gunfire, police were quick to determine that the murder was carried out by more than one suspect. However, even Shreveport Police Department homicide detective Rod Demery was unprepared for just how many killers he'll need to bring to justice

The murder of US Air Force sergeant Nathan Paet, by his wife Michelle and accomplice Corry Hawkins who sought $650,000 in insurance money. Jurors were told Paet died in front of his four children, who ranged in age from two to nine, while Michelle feigned horror and surprise

The case of Joan Dawley, who was attacked and killed by an intruder. LAPD detectives located secret home movies that revealed a shocking tale of deceit, and a monster lurking behind the scenes

The murder of Lanny Horwitz by his ex-wife Donna. She was sentenced to 32 years in prison for the September 2011 shooting, exonerating her son Radley, who she had been been happy to see accused of the act

The case of 19-year-old Connecticut man Angel Garcia who went missing in October 2011 after riding his dirt bike. Friends claimed he was chased by an sport utility vehicle before he vanished. Several months later, a possible sighting raised hopes

On Christmas morning in 2003, Sungnam Kwon Lisowski, from Illinois, went on a shooting rampage seeking crazed vengeance. Prior to shooting herself in the chest, she fatally shot her husband of 19 years John and gravely injured her both daughters, Christine, 12, and Victoria, 14. Sungnam admitted that her fury over her husband's liaison with a Chinese woman sparked the rampage. She claimed she had injured her daughters so that they wouldn't be raised by their father's mistress