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A knock at the door is normal on Halloween. A grown man in a wolf mask is still “normal” if you assume it’s just another costume. That’s what makes this San Jose true crime story so terrifying: the night looks familiar until it isn’t, and a family’s life changes in about 15 minutes.

We walk through the 1984 murder of Doreen Erbert, a 31-year-old physical therapist who is eight months pregnant and spending Halloween with her four-year-old daughter, Deanna, while her husband runs a quick errand. When someone arrives at the house wearing a wolf mask, Doreen immediately senses danger and tells Deanna to hide. Deanna survives, but she’s left to live with what she heard and what she lost. We also talk about Doreen’s earlier heartbreak, including the drowning death of her son, and how her ex-husband, Mike Dennis, spirals into years of blame and fixation.

From the wolf mask left at the scene to the blood evidence and missing weapon, the investigation builds a picture that prosecutors later argue is more than impulse. We get into the courtroom chapter too: Deanna’s testimony as a child witness, the mental health claims raised at trial, the verdict, and why this case stays in the system for decades through death penalty appeals. If you’re searching for Halloween murder cases, domestic violence warning signs, or San Jose 1984 true crime, this one will stick with you.

Listen now, then come talk to us: what detail hit you the hardest? Subscribe, share with a true crime friend, and leave a review so more people can find the show.

SOURCES:

1. California Supreme Court — People v. Dennis (1998)
   Official appellate opinion covering the murders, witness testimony, forensic evidence, investigation, and trial.
   https://law.justia.com/cases/california/supreme-court/4th/17/468.html

2. U.S. Court of Appeals for the Ninth Circuit — Dennis v. Broomfield (2024)
   Federal appeals court decision concerning William Michael Dennis's convictions and sentence.
   https://law.justia.com/cases/federal/appellate-courts/ca9/18-99008/18-99008-2024-05-28.html

3. Oxygen True Crime — Man in Wolf Mask Hacks Pregnant Ex-Wife to Death With Machete on Halloween Night
   https://www.oxygen.com/snapped/crime-news/michael-dennis-kills-ex-wife-doreen-erbert-wolf-mask-halloween

4. Oxygen True Crime — Pregnant Mom Killed With Machete After Answering Door on Halloween Night
   https://www.oxygen.com/homicide-for-the-holidays/crime-news/doreen-ebert-murder-daughter-william-michael-dennis-san-jose

5. The Cinemaholic — Doreen Erbert Murder: Where Is Mike Dennis Now?
   https://thecinemaholic.com/doreen-erbert-murder-where-is-mike-dennis-now/

6. The Cinemaholic — Where Are Deanna and Charles Erbert Now?
   https://thecinemaholic.com/where-are-deanna-and-charles-erbert-now/

7. National Crime Scene Cleanup — Doreen Erbert: A Halloween Slaying in San Jose
   https://www.crimescenecleanup.com/doreen-erberts-murder/