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Crime & Justice • Criminal case

Brendan Dassey

Brendan Ray Dassey is an American prisoner from Wisconsin who was convicted in connection with the 2005 killing of Teresa Halbach.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Brendan Ray Dassey is an American prisoner from Wisconsin who was convicted in connection with the 2005 killing of Teresa Halbach. His case drew widespread attention through the Netflix documentary series *Making a Murderer*, which focused on his interrogation and conviction.

Background

Brendan Dassey is from Manitowoc County, Wisconsin, and was born in 1989. Public reporting and court records identify him as the nephew of Steven Avery.

Criminal case

Dassey was convicted in Wisconsin for offenses connected to the 2005 killing of Teresa Halbach. Court documents describe the convictions as first-degree intentional homicide, second-degree sexual assault, and mutilation of a corpse.

Interrogation and confession

The case became controversial because investigators obtained a confession from Dassey when he was a teenager. Later legal challenges argued that the confession was coerced or improperly obtained.

Appeals and public attention

Dassey’s case went through multiple appeals in federal and state courts. It also became widely known after being featured in *Making a Murderer*.

Key facts

  • Dassey was convicted in connection with the 2005 death of Teresa Halbach in Manitowoc County, Wisconsin.
  • His interrogation and confession became a major subject of the Netflix documentary *Making a Murderer*.
  • A federal judge overturned his conviction in 2016, but appellate courts later reinstated or upheld it.
  • Dassey was 16 at the time of the interrogation cited in court and documentary accounts.
  • He was sentenced to life in prison, with parole eligibility set for 2048.
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Canadian context

The case is known in Canada largely through international true-crime media coverage, especially the Netflix series *Making a Murderer*, which had a large Canadian audience.

Frequently asked questions

Who is Brendan Dassey?
Brendan Dassey is an American prisoner from Wisconsin who was convicted in connection with the 2005 murder of Teresa Halbach.
What was Brendan Dassey convicted of?
Court records describe convictions for first-degree intentional homicide, second-degree sexual assault, and mutilation of a corpse, as a party to the crime.
Why is Brendan Dassey well known?
He became widely known after being featured in the Netflix documentary series *Making a Murderer*, which examined his interrogation and conviction.
What sentence did Brendan Dassey receive?
He was sentenced to life in prison, with the earliest possibility of parole in 2048.
Was Brendan Dassey’s conviction overturned?
Yes, a federal judge overturned it in 2016, but later appellate decisions reinstated or upheld the conviction.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/Brendan_Dassey
    Supports: Birth date, nationality, convictions, sentence, and general biography
  2. Justia — https://law.justia.com/cases/wisconsin/court-of-appeals/2013/2010ap003105-cr.html
    Supports: Court record describing convictions and the 2005 Teresa Halbach case
  3. BBC News — https://www.bbc.com/news/world-us-canada-42291231
    Supports: Appeals-court coverage and reference to *Making a Murderer*
  4. Innocence Project — https://innocenceproject.org/news/four-things-that-you-need-to-know-about-the-brendan-dassey-case/
    Supports: Case history, age at conviction, and legal challenge context
  5. ABC News — https://www.abcnews.go.com/Entertainment/court-upholds-making-murderer-brendan-dasseys-overturned-conviction/story?id=48218581
    Supports: Overturned conviction and later appellate ruling
  6. CNN — https://www.cnn.com/2016/11/14/us/making-a-murderer-brendan-dassey-release
    Supports: Release order and documentary-related public attention