S26/EP3 Detective Richard De La Vega remembers investigating Nancy Khan, who was convicted of murdering her husband, Ali Khan. In June 2018, she was sentenced to 40 years in prison for the killing. Ali was shot five times in the torso and twice in the head.

S26/EP3 Assistant District Attorney Sunday Austin reflects on the case of Ali Khan, who was gunned down in his master bathroom by his wife Nancy Khan. Austin remembers how a cemetery groundskeeper came across the murder weapon while mowing some grass. According to Austin, the serial number on the gun was a direct match to the box that was in the trunk of Nancy's car.

S26/EP3 Those involved in the case of Ali Khan, who was killed by his wife Nancy Khan, reflect on the investigation. In 2018, she pleaded guilty to killing Ali after the couple argued and he threatened to divorce her. Nancy was sentenced to 40 years in prison for her husband's slaying.

A young mother of two on her way to a birthday party is gunned down on the side of a rural highway. The ensuing investigation reveals fraying within a tight-knit family. Who wanted Beck Lynne Dillard, and what did law enforcement uncover?

A young mother of two on her way to a birthday party is gunned down on the side of a rural highway. The ensuing investigation reveals fraying within a tight-knit family. Who wanted Beck Lynne Dillard, and what did law enforcement uncover?

S26/EP2 Michael Dean, OSBI Special Agent, discusses the investigation of Beverly Rhea McColm, who pleaded guilty to the 2011 murder of Maurice Byrd.

S26/EP2 Those involved in the case of Maurice Byrd, who was gunned down in his Guthrie, Oklahoma, home, reflect on the investigation.

S26/EP2 Rico Anderson, cousin of Maurice Byrd, recalls the moment he found out Byrd had been killed by Beverly Rhea McColm.

An investigation into the murder of a successful business manager and expecting father Ali Khan leads Texas detectives to a seedy underworld and a spiteful killer. Could Ali's wife, Nancy Khan, be the key to uncovering what happened to him?

At around 1:00 p.m. on Saturday, February 28, 2015, the Williamson County Sheriff's office in Round Rock, Texas, receives an alarming 911 call. The caller reports the fatality of Ali Khan, who was gunned down in his master bathroom.

S26/EP1 Those involved in the case of 24-year-old U.S. Army Staff Sergeant Ryan Michael Sullivan, who was murdered in 2008 at his apartment in Killeen, Texas, reflect on the investigation and trial. Sullivan was killed in a plot hatched by his former girlfriend, Kathyrn Nellie Briggs, and his two friends Kyle Moesch and John Valdez. They were all later found guilty of capital murder.

S26/EP1 John Valdez, a friend of slain 24-year-old Staff Sergeant Ryan Michael Sullivan, discusses their time together in the U.S. Army. While Valdez remembers Sullivan as a dedicated leader and caring friend, Valdez was found guilty of capital murder — along with friend Kyle Moesch and Sullivan's former girlfriend Kathyrn Nellie Briggs — in connection with Sullivan's 2008 slaying.

S26/EP1 Assistant District Attorney Murff Bledsoe discusses the murder of Ryan Michael Sullivan, a 24-year-old Staff Sergeant in the U.S. Army. Just days after the slaying, Sullivan's mother received a disc of Sullivan's will from Kathyrn Nellie Briggs, his former girlfriend. Briggs, along with friends Kyle Moesch and John Valdez, were later found guilty of capital murder.

S26/EP2 On December 10, 2011, the quaint town Guthrie, Oklahoma, is shook up by the murder of 60-year-old Francis Maurice Byrd, who was reported missing by his sister after he failed to arrive at a family gathering. When police arrived at Byrd's home to execute a welfare check, officers noticed there were signs of a struggle. Byrd's body was found on the floor of his bedroom.

S26/EP2 When Francis Maurice Byrd, a 60-year-old businessman from Guthrie, Oklahoma, is found dead in the bedroom of his own home, investigators rush to track down a killer. The truth behind this heinous crime will expose a ruthless murderer hiding in plain sight. Who wanted Byrd dead, and what was their connection to him?

Prosecutor Robb Wilson reflects on the case of Georgia Watson, who was found guilty of conspiring to murder her ex-husband, Jeffrey Watson Sr., and was sentenced to 24 years in prison. The prosecution agued she murdered Jeffrey in order to cash in on a $100,000 life insurance policy on him.