TV Guide Investigation Discovery Sunday

The case of a serial arsonist who murdered four people in a California store. Two fire detectives took a special interest in the case in a bid to find the killer and someone got burnt when the truth was revealed

Seventeen-year-old Steven Willis was working in a mechanic's shop when a horrific murder rocked his family. Haunted by survivor's guilt, Steven embarked on a journey to bring the killer to justice - though three more people died before he learned the truth

The case of 36-year-old recently wed mother Carol Grannon, who disappeared in March 1999. Her remains were later found encased in concrete in a manhole. The case went cold until 12 years later when an investigator followed up on leads during a nightly drug sweep in Muskogee, Oklahoma

From the outside, 34-year-old Linda Singleton's life appeared picture perfect. However, no one knew that she was engaged in a deadly love triangle. When the affair came to light, her perfect life came to an untimely end

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

How an affair between a married pastor and a member of his flock took a shocking turn when he proposed a polygamous relationship with his wife. However, an unexpected arrival threatened their pledge of secrecy

A case in which a young man who had found work far from home vanished while on a mysterious and dangerous trip with coworkers. Plus, the young mother of four, who disappeared with only her car left behind. When a massive search was undertaken, one of the people looking for her turned into a suspect

When a dancer was shot dead in her home, detectives tried to figure out who had a motive to kill her. A cigarette found at the scene was thought to be a clue. Plus, how in an ironic twist a woman vanished while looking for her missing friend

The case of Donald Lewis, a Milwaukee jazz club owner, beloved in his community, who disappeared from his club in October 2016 along with an employee. His body was later found in the establishment's basement

The disappearance of mother Roaa Al-Dhanoon. What began as a missing persons case, took a disturbing turn by someone closest to her. Detectives had to unravel a complex web of deceit that continued to strike fear throughout the devastated local community

The case of 52-year-old Colleen Wood, who vanished in December 2000 shortly after planning a round-the-world sailing trip with her new partner, ex-racing driver and wealthy financier John Paul Sr. Her lover was questioned, but no charges were filed. Shortly afterwards he also disappeared

The case of college student Bryce Laspisa, who vanished in August 2013 en route to visit his family. He had told his parents he was going to pull over and sleep in his car, but the vehicle was found a few hours later in Castaic, California, lying on its side, with Bryce nowhere in sight

The death of Toni Henthorn in an apparent hiking accident in the Rocky Mountain National Park in 2012. Her husband Harold claimed she had slipped and fallen from a cliff ledge. He stood to gain $4.5million in life insurance from the death, and three years later evidence was assembled to convict him of murder. The conviction also raised questions about his possible involvement in the mysterious death of his first wife