Henryk Siwiak

Henryk Siwiak is documented in the ColdCaseIndex database as a homicide case in Brooklyn, New York. The events are dated to September 11, 2001. The victim is recorded as 46 years old and male. The last known information on record places the case at September 11, 2001, Brooklyn, NY.

Within the ColdCaseIndex taxonomy, Henryk Siwiak is filed under Homicide with a status of Unsolved. A homicide entry documents a killing in which the perpetrator has not been identified, has not been convicted, or where the case is otherwise historically notable. The record is cross-referenced under the themes homicide, 9/11, New York, unsolved, immigrant, which connect it to related cases across the database.

As of the most recent information compiled here, no arrest has been publicly recorded in the Henryk Siwiak case, and it remains open and unsolved. Cases like this can be reactivated at any time — advances in DNA analysis, forensic genetic genealogy, and renewed public attention have resolved cases that lay dormant for decades.

Primary jurisdiction for the Henryk Siwiak case rests with local law enforcement in Brooklyn, supported by New York state investigative authorities. The case sits within a wider national picture: the U.S. homicide clearance rate has fallen from roughly 90% in the 1960s to about 54% today, and more than 346,000 homicides recorded since 1965 remain unsolved. ColdCaseIndex documents individual cases like this one to keep them publicly visible and searchable.