U.S. Homicide Analysis
CDC NVSS counts homicides from death certificates (medical examiner/coroner determination). Includes all jurisdictions and captures cause of death regardless of arrest. Used for rates and trends.
FBI UCR/SHR/NIBRS counts crimes reported by law enforcement. SHR adds circumstance and victim-offender relationship detail but only where agencies report. Circumstance is known in ~50–60% of cases.
Counts differ: CDC 2023 ≈ 19,982 vs. FBI reported ≈ 19,200. Both are valid; CDC is preferred for mortality rates, FBI for criminal circumstances.
Homicide clearance rates fell to ~50% in 2022. Without an arrest, circumstance and offender relationship often remain "unknown" in SHR data — this is a data quality issue, not necessarily that the event was unmotivated.
Unknown circumstance share rose from 22% (1985) to 43% (2022) per Council on Criminal Justice analysis of SHR data.
FBI "justifiable homicide by private citizen" (~350–400/yr) requires law enforcement classification. Defensive killings may be initially recorded as criminal homicides; final disposition may not update UCR.
Non-fatal defensive gun uses are excluded entirely from homicide statistics.
Studies in select cities (Chicago, Philadelphia, etc.) find 70–80%+ of gun homicide decedents had prior arrests. This describes victim history, not legal guilt in the fatal incident. Do not conflate with offender criminality.