In this episode, journalist Keith Morrison interviews Brittanee's relatives and friends, including her father Chad Drexel, and investigators about the search for the Chili teenager that spanned more than 13 years.

Brittanee was 17 and a Gates Chili High School junior when she went missing in April 2009 while on a spring break trip to Myrtle Beach, a trip she took without her parents' knowledge or permission.

During the two-hour-long episode, Morrison also questions Raymond Moody, the man who has admitted to kidnapping and murdering Brittanee Drexel. Authorities believe Brittanee was killed the same day she disappeared.

On May 16 of this year, South Carolina authorities announced that Brittanee's remains had been found about 35 miles south of Myrtle Beach. Days later, Moody, a convicted sex offender and longtime person of interest in the case, was charged with kidnapping, murder and first-degree sexual misconduct in Brittanee's death.

Moody pleaded guilty in October and admitted he killed Brittanee, saying, "I was a monster when I took Brittanee Drexel's life."

Also, during the episode, Morrison interviews Georgetown County Sheriff Investigator Phil Hanna, Myrtle Beach Police Investigator Mike Hull and Captain Kin McKenzie of the South Carolina Law Enforcement Division, who together explain how officers zeroed in on Moody.

A hunting safari in Zambia's Kafue National Park ends in a nightmare when a shot rings out from the cabin of dentist Larry Rudolph and his wife, Bianca. Andrea Canning reports.

Florida detectives investigate a murder mystery in a wealthy gated community.

Investigators embark on a 15 year hunt for the killer of a Wisconsin pharmacist.

Insiders reveal new details about the deaths and legal cases surrounding Alex Murdaugh.

Firefighters make a grisly discovery while responding to a house fire in a Toronto suburb.

The investigation into a deadly home invasion involving business owner Milton Sawyer takes a turn when an unlikely witness on the other side of the country comes forward. Dennis Murphy reports.

The disappearance of Sonya Ivanoff sends shockwaves through the small coastal city of Nome, Alaska.

A family begins a relentless pursuit of justice after the death of Nevada attorney Susan Winters.

After the cause of the death of Stacy Feldman in her Denver home is ruled as undetermined, friends and family join forces to piece together what happened; insiders close to the case speak out about the seven-year battle for justice.

Texas detectives uncover a trail of sexual assault crimes while investigating a murder.

Keith Morrison reports on the murder of star gravel cyclist Anna Moriah Wilson and interviews insiders in the case that sparked worldwide headlines.

Amber Heard sits down with NBC News' Savannah Guthrie in her first interview since the defamation trial brought by her ex-husband Johnny Depp.

Chef Dan Brophy arrived for work at the Oregon Culinary Institute in Portland, Oregon, early on Saturday, June 2, 2018.

The Culinary Institute, also referred to as OCI, was both a school and a restaurant. That Saturday was a test day for students and as a chef and teacher there, Dan had much to prepare.

But just minutes after he got to work, Dan Brophy was shot in the back in Kitchen One. About ten minutes later, a colleague found Dan lying on his back in front of a large kitchen sink. A student called 911.

EMTs soon arrived and pronounced Dan Brophy dead. He was 63. Josh Mankiewicz reports.

When an 18-year-old disappears from her Virginia home, the investigation into her inner circle of trusted friends and family reveals a sinister betrayal. Andrea Canning reports.

Dateline (again) investigates the 2012 murder of Leslie Neulander, a 61-year-old woman who died in her 8,000 square-foot mansion in DeWitt, New York, a suburb of Syracuse. Neulander's death was initially reported as an accident, that she had a bout of vertigo, slipped and fell in the shower, fatally hitting her head on a marble bench in the shower.

In 2015, Leslie's husband, former OB/GYN Dr. Robert Neulander, was found guilty of her murder. After Neulander spent three years in prison, a court overturned the conviction in 2018 because of one juror's misconduct. Throughout his first and second trials, Robert Neulander has received strong support from his two children, Ari and Jenna, and Leslie's sister, Joanne London. 

After a prominent plastic surgeon is murdered in his Asheville, North Carolina home, investigators uncover a trail of clues pointing to an unlikely killer. Keith Morrison reports. 

Detectives search for answers after 34-year-old mother Annastasia "Annie" Hester is stabbed to death in a Portland, Oregon suburb; investigators uncover personal details that point to multiple suspects and possible motives.

The detectives who cracked the case of Sherri Papini, a California mother who alleged she was kidnapped and held hostage for three weeks in 2016, reveal new details about the investigation that captivated the nation.

The latest in the case of Pam Hupp, charged with murdering her friend Betsy Faria. Keith Morrison interviews Leah Askey, the prosecutor behind the wrongful conviction of Betsy's husband, Russ as well as Betsy's daughter, mother, and husband Russ Faria.

When a former Arkansas State Senator is found fatally stabbed, investigators must determine if her murder is connected to her political career or her personal life. Dennis Murphy reports.

New details emerge in an alleged murder-for-hire plot targeting a former NYC cop's husband.

A family gathering ends with one man dead, leading to more than a decade of questions — was it suicide or murder? Keith Morrison reports on the latest twist in the case.

While investigating the disappearance of Pamela Butler in Washington D.C., detectives discover a puzzling connection to Virginia resident Marta Rodriguez, who vanished two decades earlier. Dennis Murphy reports.

A mystery in paradise unfolds when a British woman, Sarm Heslop, vanishes from her boyfriend's luxury yacht in the U.S. Virgin Islands. New details emerge on the case that made international headlines and left investigators with more questions than answers. Andrea Canning reports

When a world-renowned snake breeder is found dead, first responders originally think his missing anaconda could be to blame. As the frantic hunt for a missing snake begins, the investigation soon reveals a tragic family saga and a sinister betrayal. Andrea Canning reports.

When a Colorado mother Suzanne Morphew vanishes on Mother's Day in 2020, investigators are left with minimal clues until a recording device exposes a potential motive. New details emerge from exclusive interviews with insiders close to the case. Keith Morrison reports.

Investigators search for answers after a 17-year-old is murdered after a Valentine's Day dance.

A Connecticut mother speaks out about her fight to keep her assailant from walking free.

Keith Morrison reexamines the mysterious death of Las Vegas casino magnate Ted Binion.