Summary of Case 349: Michael Wallace & David Castor

Overview of Case 349: Michael Wallace & David Castor

This episode of Casefile Presents examines the disturbing case of Stacey Castor, a New York mother and widow who was convicted of murdering her second husband, David Castor, and attempting to kill her daughter Ashley Wallace. Investigators ultimately concluded that Stacey had also poisoned her first husband, Michael Wallace, years earlier, using antifreeze and other toxins to stage both deaths as natural causes or suicide. The case stands out for its chilling pattern of deception, the attempt to frame a family member, and the sheer cruelty of the poisonings.

What Happened

David Castor’s death

• In August 2005, Stacey Castor called police for a welfare check after saying her husband David had locked himself in the bedroom and was acting erratically.
• Police found David dead on the bed, with antifreeze, vomit, and a shotgun nearby.
• Stacey initially claimed he had been depressed and drinking heavily, and suggested he may have killed himself.
• But several details seemed staged:
  • A clean antifreeze bottle and glass
  • A turkey baster in the kitchen trash containing antifreeze
  • Fingerprints on the glass belonging to Stacey, not David
  • Phone records showing Stacey had not been making the frequent calls to David that she claimed

Why police became suspicious

• David’s autopsy confirmed antifreeze poisoning.
• His relatives rejected the suicide theory, noting he was not suicidal and would not likely choose such a painful death when a shotgun was available.
• Investigators grew convinced the scene had been carefully arranged to look like self-harm.
• David’s will also raised eyebrows: it left everything to Stacey and, if she died first, to her daughters, cutting out his own son.

Stacey’s first husband, Michael Wallace

• The investigation widened when police noticed similarities between David’s death and that of Stacey’s first husband, Michael Wallace, who died in 2000.
• Michael had earlier suffered bizarre symptoms consistent with poisoning, but no autopsy was done at the time.
• After Michael’s body was exhumed, forensic testing found antifreeze crystals in his organs, confirming he too had been poisoned.
• Rat poison was also detected, making it clear this was not a simple or accidental death.

The Attempt on Ashley Wallace

The staged suicide note

• In September 2007, Stacey’s daughter Ashley was found nearly dead after an overdose.
• A typed note beside her bed appeared to confess that she had killed both husbands and tried to explain everything as an act done “for” her mother.
• Ashley survived, and police quickly determined the note had been written on Stacey’s computer in stages over time.
• The note contained details only the killer would know, including the presence of rat poison in Michael’s remains.
• Investigators believed Stacey had written it to pin the murders on Ashley if the poisoning attempt failed.

How Ashley was poisoned

• Evidence suggested Stacey had given Ashley vodka mixed with pills over two days.
• Ashley had no history of suicidal intent and said her mother had urged her to drink.
• She was found with dangerously high drug levels in her system and nearly died.

Key Evidence Against Stacey

Forensic and digital evidence

• Stacey’s fingerprints were on the glass containing antifreeze.
• David’s DNA and saliva were found on the turkey baster, suggesting it had been used to administer poison directly.
• Computer records showed the fake suicide note had been drafted well before Ashley’s overdose.
• Phone records contradicted Stacey’s claims that she had repeatedly called home to check on David.

Behavioral evidence

• Stacey’s calm, detailed account of events struck investigators as unusually controlled for a newly widowed spouse.
• She showed little outward grief after both husbands’ deaths.
• Her behavior after Ashley’s overdose, including socializing in the backyard while Ashley lay dying, further damaged her credibility.

The Trial and Verdict

• Stacey was charged with David Castor’s murder and Ashley Wallace’s attempted murder.
• She testified in her own defense and maintained that:
  • Michael died of natural causes
  • David killed himself
  • Ashley wrote the note and tried to frame her
• The defense argued that Ashley was unstable and could have been responsible.
• The prosecution countered that Stacey had the motive, opportunity, and forensic links to both poisonings.
• The jury found Stacey guilty on all counts after about 16 hours of deliberation.

Sentence and Aftermath

• Stacey Castor was sentenced to 25 years to life for murder and 25 years to life for attempted murder.
• Because of the sentences, she would have had to serve more than 51 years before parole eligibility.
• She continued to proclaim her innocence in later media interviews.
• Stacey died in prison in 2016 of a heart attack.
• Her burial was especially grim: she was laid to rest in a grave with Michael Wallace, with David later moved elsewhere.

Main Takeaways

• Stacey Castor’s case is a classic example of a murder initially disguised as suicide.
• The episode highlights how forensic details, phone records, and digital evidence can unravel a carefully staged crime.
• The attempted framing of Ashley Wallace was a central and especially disturbing part of the case.
• Police ultimately believed Stacey’s first husband was likely murdered too, even though she was never legally convicted for that death.

Notable Points

• Antifreeze poisoning can mimic intoxication at first, making it a deceptive and painful method of killing.
• The fake suicide note was one of the most damning pieces of evidence, especially because it contained insider knowledge about Michael’s death.
• The case is widely remembered for its cold, methodical pattern and the possibility that Stacey might have continued killing if she had not been caught.