cold case
An unsolved criminal investigation that remains open but inactive after all immediate investigative leads have been exhausted, eligible for reopening if new evidence emerges.
Definition
A cold case is an unsolved criminal investigation in which all probative investigative leads have been exhausted but the case remains officially open. The term is not formally defined in the federal criminal code as a general category, but functions as a practical designation used by law enforcement agencies to categorize investigations that are inactive yet not formally closed.
In federal practice, a cold case typically involves a serious crime—most commonly homicide—where initial investigative efforts failed to identify a perpetrator or produce sufficient evidence for prosecution. The case remains in this status until new evidence surfaces, witnesses come forward, or advances in forensic technology enable re-examination of existing evidence. Modern DNA analysis and forensic genealogy have proven particularly effective in resolving cold cases from prior decades.
The federal government has formalized cold case investigation in specific contexts, most notably through the Emmett Till Unsolved Civil Rights Crime Act of 2007. This legislation, codified at 34 U.S.C. § 30504, authorizes federal resources to investigate unsolved civil rights murders from the era before 1970, particularly racially motivated killings. The Department of Justice's Civil Rights Division operates a Cold Case Initiative under this authority to pursue decades-old cases involving violations of civil rights that resulted in death.
While no statute of limitations applies to murder prosecutions under federal law, cold cases present significant evidentiary challenges. Witnesses may be deceased or unavailable, physical evidence may have degraded, and investigative documentation from decades past may be incomplete. Nevertheless, cold case units in federal, state, and local agencies continue to apply contemporary investigative techniques to historical cases, occasionally achieving prosecution and resolution years or even decades after the original crime.
Related entries
Related articles
Alt om Martha Moxley mordsag: dokumentarer, bøger og podcasts
Martha Moxley blev myrdet i Greenwich, Connecticut den 30. oktober 1975. Sagen blev først opklaret i 2002, da Michael Skakel blev dømt for drabet. Her er det samlede overblik over alle dokumentarer, serier, podcasts og bøger om sagen.
The Unsolved Murder of Joann Bartholomew - October 21 2026
Morning Cup of Murder revisits the 1987 killing of Joann Bartholomew, a case that looked simple but remains unsolved decades later.
A Private Matter, Episode 2
Jay's daughter recalls realizing her father was missing, and police uncover a new detail about the timing of his disappearance.
A Private Matter, Episode 1
A Christmas tree farmer with dementia disappears in rural New Hampshire, and his wife never reports him missing — this Bear Brook episode traces the strangeness that follows.
MURDERED: Nori Amaya
Crime Junkie revisits the unsolved 2009 Halloween-night murder of D.C. restaurateur Nori Amaya, strangled in her bed despite DNA evidence and surveillance footage.
The Devil's Audition - Part Three
The finale of The Devil's Audition traces how Valerie McDonald's remains, found in 1991, were finally identified as hers a decade later.
A Cold Case in Manitoba, Canada - October 16 2026
Morning Cup of Murder revisits the unsolved 1986 disappearance of teenager Kerrie Brown after a night out in Manitoba, Canada.
The Devil's Audition - Part Two
The Devil Within's second episode on the Valerie McDonald case revisits her disappearance from San Francisco, the men who surrounded her, and the remains found years later.
He Talked About Killing Tupac for Years. Why Did It Take Three
Criminal interviews journalist Joel Anderson about why it took 30 years to bring Duane 'Keffe D' Davis to trial for Tupac Shakur's murder.
MISSING: Gregory ‘Keith’ Mann Jr.
Crime Junkie examines the unsolved 1997 disappearance of 20-year-old Keith Mann, last seen after a mysterious midnight meeting in Wichita Falls.
The Colonial Parkway Murders - October 12 2026
Morning Cup of Murder revisits October 12, 1986, when the first two bodies in the Colonial Parkway Murders case were found in Virginia.
The Vanishing of Deborah Ann Quimby - October 9 2026
Morning Cup of Murder marks the birth of Deborah Ann Quimby, who disappeared in 1977 after riding her bike to meet someone.