Knife wounds

DEFINITION: Puncture or slash wounds caused by knives or other sharp instruments.

SIGNIFICANCE: In cases of deaths involving knife wounds, forensic pathologists can determine useful information from the patterns and types of wounds, both about the weapons and about the persons who wielded them.

By examining the pattern of injuries and the type of wounds inflicted by a knife, a forensic pathologist can often determine what type of knife was used, which hand the assailant used to hold the knife, the order in which the wounds were inflicted, and which of the wounds was the one that caused death.

A knife can cause different kinds of wounds, depending on the way an assailant wields it. For example, if the assailant jabs with the knife, it will cause a deep puncture wound. Alternatively, if the knife is used to slash, the wounds will be long but superficial. The pattern of the wounds can help determine where the assailant was standing in relationship to the victim, with which hand the assailant held the knife while assaulting the victim, whether the victim was above or below the assailant, and even clues about the state of mind of the assailant (indicated by the type of wound, such as slashing or jabbing, the number of wounds inflicted, and the speed and ferocity of the attack). A blood spatter pattern found at a crime scene can also help investigators to determine whether wounds were inflicted by a knife.

From the depths and locations of knife wounds, a forensic pathologist can determine the order in which the wounds were caused and even determine which one actually caused death. If this is an important issue, the pathologist must examine the wounds carefully, as knife wounds are often inflicted very close to one another or even on top of each other. By carefully examining the tissues, the pathologist can usually determine which damage was caused first, and so can determine which wound caused the death. Bleeding patterns and blood spatter patterns are sometimes helpful in determining which wound caused death.

Because assailants who use knives must handle their weapons during their attacks, knives can be a good source of forensic evidence. A knife may retain the user’s fingerprints, blood or other body fluids, or skin cells. It may even retain fibers from the assailant’s clothing or household items that can link a suspect to the crime through DNA or other evidence. A knife may also retain a victim’s blood, thus linking a knife not found at the scene of the crime with the crime committed. Knives may also give clues as to where they were manufactured or purchased, helping to identify assailants through purchase records.

Bibliography

Byrd, Mike. Crime Scene Evidence: A Guide to the Recovery and Collection of Physical Evidence. Staggs, 2001.

Fisher, Barry A. J. Techniques of Crime Scene Investigation. 7th ed., CRC Press, 2004.

Gitto, Lorenzo, and Ponni Arunkumar. “Sharp Force Injuries.” PathologyOutlines.com, 20 May 2022, www.pathologyoutlines.com/topic/autopsysharpforce.html. Accessed 17 Feb. 2026.

Hussain, Asif. “Forensic Insights into Multiple Stab Wounds: Autopsy Findings from a Case of Sixty Stab Wounds.” Journal of Forensic Science and Research, 2025, vol. 9, no. 1, pp. 21–24, doi: 10.29328/journal.jfsr.1001075. Accessed 17 Feb. 2026.

James, Stuart H., and Jon J. Nordby, editors. Forensic Science: An Introduction to Scientific and Investigative Techniques. 2nd ed., CRC Press, 2005.

Payne-James, Jason, et al., editors. Forensic Medicine: Clinical and Pathological Aspects. Greenwich Medical Media, 2003.

Saferstein, Richard. Criminalistics: An Introduction to Forensic Science. 9th ed., Pearson Prentice Hall, 2007.