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 Conviction of Angel Bumpass - October 3 2026
Morning Cup of Murder looks at the 2019 conviction of Angel Bumpass, a suspect not found for almost a decade in a murder case.
The Long Unsolved Murder of a Judge and His Wife - October 1 2026
Morning Cup of Murder revisits the 1960 arrest tied to a long-cold judge's murder case, where ambition led two people to a deadly end.
Blamed on Bundy | The Book of Regrets | 3
Cold's third episode revisits the Nancy Baird disappearance, the Bundy folklore that followed, and a discovery that later cast doubt on it.
True Crime Time For September 29, 2026
Real Life Real Crime examines a possible new lead in the unsolved 1982 Chicago Tylenol Murders, plus a cruise ship disappearance and other cases.
Julie Jensen, Part 1: The Letter She Left Behind
The Dark Matter Moms podcast covers Julie Jensen, who left a letter before her 1998 death warning police to suspect her husband if anything happened to her.
MURDERED: Dorothy “Toby” Tate
The episode covers how detectives reopened the 1983 murder of Toby Tate, and how preserved DNA evidence finally revealed a surprising twist.
Listen Now: My Mom’s Murder
Lauren Malloy investigates the murder of her mother Lori in East Providence, Rhode Island, after decades of lies about her death.
Blamed on Bundy | Everyone Knew Everyone | 1
The debut episode of Cold examines the 1975 disappearance of gas station clerk Nancy Perry Baird from East Layton, Utah.
MURDERED: Marina Ramos
An episode covering the 1989 murder of Marina Ramos in Mohave County, Arizona, and the mystery of her missing children.
Introducing COLD: Blamed on Bundy - The Disappearance of Nancy Baird
A trailer for Cold's new season on Nancy Perry Baird's 1975 disappearance, once blamed on Ted Bundy without evidence.
MYSTERIOUS DEATH OF: Lakesha Thompson
This true crime episode revisits the disputed 2023 death of Lakesha Thompson, questioning the official ruling that her family refuses to accept.