In Washington State, a father picks up his daughters for visitation. When he fails to bring them home, their mother reports the girls missing. As a search begins, a mother's worst fears become reality. Now, it seems that the story may be coming to a close. Join Olivia Cornu and John Conner as they dive deep into the dark to discuss an update to a developing story and the loss of three innocent children. Will this case be enough to make you check the locks?

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Check the Locks is Supported By: 

Audible: Enjoy 30 Days for Free

This episode of Check the Locks is dedicated, with love, to the memory of our friend Mathew Scott Halliday. 

Sources:

https://www.fox13seattle.com/news/murdered-wa-girls-cause-of-death

https://www.kiro7.com/news/local/human-remains-believed-be-travis-decker-found-area-south-leavenworth/OF7AGXFQFFBRFJFN2RFJUT3EKQ/

Travis Decker timeline: How an 'active dad' ended up allegedly murdering his 3 daughters - ABC News

After 1 month search, father accused of killing 3 daughters could still be alive, expert says - ABC News

A missed drop-off and tragedy at a campground. How a manhunt for a father accused of killing his 3 daughters is unfolding | CNN

In 2013, a Doctor of Neurology, and rising star, collapsed suddenly in her Pittsburgh home. Days later, she was gone. As investigators searched for answers, they discovered her husband had purchased a deadly poison just before her death. Join Olivia Cornu and John Conner as they dive deep into the dark to discuss the murder of Dr. Autumn Klein. Will this case be enough to make you check the locks?

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Check the Locks is Supported By: 

Audible: Enjoy 30 Days for Free

This episode of Check the Locks is dedicated, with love, to the memory of our friend Mathew Scott Halliday. 

Sources:

Neuroscientist Charged with Homicide in Wife's Cyanide Death - ABC News

US researcher Robert Ferrante guilty of poisoning wife - BBC News

Pittsburgh Post-Gazette: Irretrievably Broken / The story of Autumn Klein and Robert Ferrante

Former Pitt researcher denied appeal for new trial - CBS Pittsburgh

When a welfare check leads South Carolina deputies to a quiet Myrtle Beach home, they expect a routine visit. But what they find is anything but. A blood-covered woman answers the door—and inside, a horrifying trail leads officers to a locked closet... and a chilling discovery. Join Olivia Cornu and John Conner as they dive deep into the dark to discuss a developing story. Will this case be enough to make you check the locks?

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Check the Locks is Supported By: 

Audible: Enjoy 30 Days for Free

This episode of Check the Locks is dedicated, with love, to the memory of our friend Mathew Scott Halliday. 

Sources:

Warrant: Suspect shot victim in head; locked him in closet in Burgess area home

Woman accused of locking ex-husband’s body in closet after Horry Co. shooting denied bond

Judge Says Joyanna Vansant Is 'An Unreasonable Danger to Others' | Court TV Video

For 26 years, Bob Siders fought for justice. Hoping to find his daughter's killer. Thanks to the work of dedicated investigators, Bob finally got the answers he was looking for. Join Olivia Cornu and John Conner as they dive deep into the dark to discuss part 1 of the murder of Shannon Siders. Will this case be enough to make you check the locks?

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Check the Locks is Supported By: 

Audible: Enjoy 30 Days for Free

This episode of Check the Locks is dedicated, with love, to the memory of our friend Mathew Scott Halliday. 

Sources:

https://www.newspapers.com/image/1082597884/?match=1&terms=Shannon%20Siders%20

https://www.newspapers.com/image/1129260553/?match=1&terms=Shannon%20Siders%20

https://www.newspapers.com/image/1192332626/?match=1&terms=Shannon%20Siders%20

Juries find brothers guilty of 1989 murder

Convictions upheld for brothers in 'grisly' 1989 Newaygo County murder

https://www.newspapers.com/image/1082292698/?match=1&terms=Shannon%20Siders%20

Entire Town Was a Suspect—22 Years to Solve Shannon’s Murder (S1, E9) | Cold Case Files | Full Ep

In the summer of 1989, an 18-year-old girl vanished after a night out with friends in Newaygo, Michigan. Three months later, a hunter made a chilling discovery deep in the Manistee National Forest—her brutally beaten body. For decades, her murder went cold, haunting the tight-knit community and leaving her family desperate for answers. Join John Conner as he dives deep into the dark to discuss part 1 of the murder of Shannon Siders. Will this case be enough to make you check the locks?

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Check the Locks is Supported By: 

Audible: Enjoy 30 Days for Free

This episode of Check the Locks is dedicated, with love, to the memory of our friend Mathew Scott Halliday. 

Sources:

https://www.newspapers.com/image/1180338475/?match=1&terms=Shannon%20Siders

https://www.newspapers.com/image/1119315155/?match=1&terms=Shannon%20Siders%20Funeral

https://www.newspapers.com/image/1119174954/?match=1&terms=Shannon%20Siders

https://books.google.com/books?id=svQDAAAAMBAJ&pg=PA9&lpg=PA9&dq=Shannon+Siders+murder&source=bl&ots=B6cTRm9aLp&sig=y-4AX_ZnTXvgiN9Mr8rH1g569E8&hl=en&ei=dpf6S_KsGoyENvHUqIQI&sa=X&oi=book_result&ct=result&resnum=3&ved=0CBoQ6AEwAg#v=onepage&q&f=false

New Evidence Solves 25 Year Old Cold Case | Psychology Today

Anatomy of a cold case: 10 breaks that helped solve 1989 murder - mlive.com

Why Did It Take So Long to Solve the Murder of West Michigan's Shannon Siders?

Entire Town Was a Suspect—22 Years to Solve Shannon’s Murder (S1, E9) | Cold Case Files | Full Ep

In September 2025, a traffic stop in southern Illinois uncovered a chilling scene—a man behind the wheel with his wife's lifeless body in the car. Investigators soon traced the crime back to the couple’s home. What led to this tragic betrayal? Join John Conner as he dives deep into the dark to discuss the murder of Amy Finney. Will this case be enough to make you check the locks?

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Check the Locks is Supported By: 

Audible: Enjoy 30 Days for Free

This episode of Check the Locks is dedicated, with love, to the memory of our friend Mathew Scott Halliday. 

Sources:

Man charged with murder in shooting death of wife in Jefferson County, Ill.

https://www.wsiu.org/wsiu-local-news/2025-09-02/jefferson-county-murder-investigation-results-in-arrest-of-mt-vernon-man

Man charged after wife's body found in car during southern Illinois traffic stop

In 2010, an everyday family vanished from their Southern California home without a trace. Their SUV was found near the border, and many believed they had fled to Mexico. But years later, a shocking discovery in the Mojave Desert revealed the truth—the family had been brutally murdered. Who would want an entire family dead, and why? Join Olivia Cornu and John Conner as they dive deep into the dark to discuss the murder of the McStay family. Will this case be enough to make you check the locks?

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Check the Locks is Supported By: 

Audible: Enjoy 30 Days for Free

This episode of Check the Locks is dedicated, with love, to the memory of our friend Mathew Scott Halliday. 

Sources:

McStay murders: A man is on death row for the brutal killings of a young family found in shallow graves in the desert – but did he really do it? | The Independent

California man sentenced to death in killings of McStay family members in 2010

The McStay Family Murders And The 'Monster' Behind Them

In the late 1990s, Lahore, Pakistan, was gripped by fear when a mysterious figure began preying on the most vulnerable—runaway and homeless boys. When police received a chilling letter of confession, the horrifying truth was revealed. Join Olivia Cornu and John Conner as they dive deep into the dark to discuss the "killer of 100 boys," Javed Iqbal. Will this case be enough to make you check the locks?

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Check the Locks is Supported By: 

Audible: Enjoy 30 Days for Free

This episode of Check the Locks is dedicated, with love, to the memory of our friend Mathew Scott Halliday. 

Sources:

The Gruesome Story Of Javed Iqbal, The Pakistani Serial Killer Who Murdered 100 Boys

LAHORE: Javed Iqbal, accomplice found dead in jail - DAWN.COM

BBC News | SOUTH ASIA | Pakistan 'serial killer' under interrogation

Javed Iqbal | Pakistani Serial Killer, Arrest & Sentence | Britannica

When San Diego parents used a reputable childcare site, they thought their children were safe. Instead, the trusted babysitter and her boyfriend committed horrifying crimes against the most vulnerable kids. Join John Conner as he dives deep into the dark to discuss the childcare predator, Brittney Lyon. Will this case be enough to make you check the locks?

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Check the Locks is Supported By: 

Audible: Enjoy 30 Days for Free

This episode of Check the Locks is dedicated, with love, to the memory of our friend Mathew Scott Halliday. 

Sources:

California Sitter Accused Of Molestation

Pair accused of sexually assaulting 2 girls

Babysitter Who Provided Special-Needs Children for her Boyfriend to Molest Sentenced to Life in Prison

Who is Brittney Mae Lyon? California babysitter gets 100 years in prison for providing boyfriend with girls to molest - Hindustan Times

‘Sick and evil monster’: California babysitter gets 100 years for sexually abusing children with boyfriend; ‘bartered’ them for dates - Times of India

Ex-babysitter faces 100-year term in state prison following guilty plea to molesting young girls

Carlsbad man gets 8 life sentences for molesting children supplied to him by a babysitter | KTLA

Carlsbad man gets 8 life sentences for molesting children | AP News

Couple Pleads Not Guilty to Sexually Assaulting 7-Year-Old Girls

On August 21st, 1996, an 11-year-old girl vanished from her quiet Moline, Illinois, neighborhood. Witnesses reported seeing her climb into a gray sedan with an unknown man—and she was never seen again. For decades, the case went cold, leaving her family desperate for answers. Now, nearly 29 years later, a shocking indictment has brought new hope for justice. Join John Conner as he dives deep into the dark to discuss the disappearance of Trudy Appleby. Will this case be enough to make you check the locks?

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Check the Locks is Supported By: 

Audible: Enjoy 30 Days for Free

This episode of Check the Locks is dedicated, with love, to the memory of our friend Mathew Scott Halliday. 

Sources:

Cold Cases - Crime Stoppers of Quad Cities

Man arrested in murder of 11-year-old Trudy Appleby, who disappeared in 1996 in Moline, Illinois - CBS Chicago

Trudy Leann Appleby

‘Person of interest’ in Trudy Appleby case has died | OurQuadCities

Trudy Appleby's disappearance, 28 years later | wqad.com

Who is the man indicted in Trudy Appleby’s death?

Moline police identify two more ‘persons of interest’ in Trudy Appleby disappearance

Man indicted in Trudy Appleby disappearance

Best friend of girl, 11, who vanished 29 years ago sends heartbreaking plea to accused killer | Daily Mail Online