Susan Casey, Walter ‘Marty’ Larson: Dateline NBC Analyzes Case Of Missing Montana Mother Whose Body Was Found In The Yellowstone River

Susan Casey, the Glendive Montana, mother who disappeared but was later found murdered, will be the focus of tonight’s Dateline NBC. The case of Susan Casey is among a slew of other true stories that made the cut for Dateline NBC‘s new season. Susan Casey was a 34-year old mother of four children whose body was found floating in the Yellowstone River back in 2008. An autopsy report concluded that she had been strangled. The murder went unsolved for a few years until her ex-husband, 41-year old Walter Larson, was finally arrested. Larson was eventually convicted in her death in 2015 and sentenced to 100 years in prison, where he remains today. Dateline NBC watchers will hear from law enforcement personnel and family members of the victim. The victim and her ex-husband were married and divorced in the 1990’s, but court records show that he continuously stalked her, according to the Billings Gazette.

Glendive residents were concerned after Susan Casey vanished after being dropped off to her apartment in 2012. But when she was later found dead, police had a hard time establishing who might have killed her. They had to investigate three men in her life, her current lover, her ex-husband Walter Larson, and her current husband from whom she had recently separated, Ted Casey. Surveillance videos and phone records were helpful in ruling out her new boyfriend and her newly estranged husband. Prosecutors stated that Walter Larson thought that he and Susan were going to get back together after she broke up with her recent husband. But things took a turn when he found out that Susan had a new guy. On the night that she vanished, she had recently had sex with her new boyfriend, just before he dropped her off in the wee hours of the morning across the street from her home at the Ponderosa Apartments. It was the last time anyone saw her alive.

According to her bio, Susan Casey, also known as, Susan Marie Casey, was born in 1974 in Wolf Point. She attended Circle High School and later attended Billings Business College. Susan loved taking care of people and had a medical background, assisting in a nursing home facility, and later working in medical transcription at a local hospital. She was beloved by everyone who knew her.

Family members who have erected a tribute page on Facebook in memory stated the following, just after the announcement of the guilty verdict.

“The verdict was guilty on all counts. He will now get what he deserves and we can move forward in healing. Having this weight lifted off of us is so relieving. For me it was like it was always there and just when u thought u could move on u turned the corner and it was there again. Maybe now we can all focus on our healing….focus on ourselves and it won’t feel like there is anything hanging over our heads.”

Sadly, one of Susan’s daughters, Marya Storm Larson, died in a car accident at the age of 18 in 2012. Marya Storm Larson was also the daughter of convicted killer Walter Larson.

Susan Casey’s case was also featured on the show True Crime with Aphrodite Jones. To see how police were able to unravel the case, be sure to watch Dateline NBC tonight at 9/8 central. Recently, the Inquisitr reported on two other Dateline NBC episodes involving the case of Michelle Mockbee and Justin Michael.

Here is Dateline NBC’s tease for tonight’s episode entitled Footprint In The Dust.

“Susan Casey, a loving mother of four vanishes just 20 steps from her apartment in a small Montana town. Police soon discover that three men in her life were on her street in the early morning hour when she disappeared.”

[Photo Credit: In memory of Marya Storm, Susie Marie and Rusty Lou/Facebook]