Third-degree assault in Missouri is a Class E felony committed by knowingly causing physical injury to another person.1Missouri Revisor of Statutes. Missouri Code 565.054 – Assault in the Third Degree It carries up to four years in prison and a fine of up to $10,000. If the person you injured falls into a protected category the law calls a “special victim,” the charge becomes a Class D felony with a maximum of seven years. Since Missouri’s 2017 criminal code revision made this offense a felony rather than a misdemeanor, a conviction stays on your record for life.
What the Prosecution Has to Prove
Two elements. First, that you caused physical injury. Missouri defines physical injury as any slight impairment of a body function or temporary loss of use of any body part.2Missouri Revisor of Statutes. Missouri Code 556.061 – Code Definitions The threshold is low. A bruise, a minor cut, or brief pain affecting how someone uses a hand can qualify. The injury does not have to be permanent or serious.
Second, that you acted knowingly. That means you were aware your conduct was practically certain to cause the injury. You don’t have to have planned the harm. Shoving someone hard enough that you knew they would hit the ground meets the standard. A genuinely accidental injury does not, and neither does reckless conduct without awareness, though either may support other charges.
Penalties and the Special-Victim Enhancement
In most cases, third-degree assault is a Class E felony with a maximum of four years in prison.3Missouri Revisor of Statutes. Missouri Code 558.011 – Sentence of Imprisonment, Terms Fines can reach $10,000, or double any financial gain from the offense, whichever is greater.4Missouri Revisor of Statutes. Missouri Code 558.002 – Fines for Felonies Judges have discretion to impose probation instead of prison, typically for up to five years with conditions like check-ins, drug testing, community service, or counseling. Criminal history, the severity of the injury, and the surrounding circumstances all weigh into that decision.
The picture changes when the victim is a “special victim.” That designation more than doubles the maximum sentence, upgrading the charge to a Class D felony with up to seven years in prison.1Missouri Revisor of Statutes. Missouri Code 565.054 – Assault in the Third Degree Missouri defines special victims broadly.5Missouri Revisor of Statutes. Missouri Code 565.002 – Definitions The category includes law enforcement officers, firefighters, EMTs, and emergency room staff; corrections and probation officers; highway workers in construction or work zones; utility and cable workers; and mass transit employees like bus and light rail workers. For all of these, the enhancement applies when they were performing their job or were targeted because of it. The designation also covers elderly persons, persons with disabilities, and vulnerable persons, and applies to them regardless of circumstances.
Common Defenses
Self-defense is the most frequently raised defense to any assault charge. Missouri law allows you to use physical force when you reasonably believe it is necessary to protect yourself or someone else from unlawful force being used or about to be used.6Missouri Revisor of Statutes. Missouri Code 563.031 – Use of Force in Defense of Persons Missouri is a stand-your-ground state. You have no legal duty to retreat before using force anywhere you have a right to be.
Self-defense fails, though, if you were the one who started the confrontation, unless you clearly withdrew and the other person kept coming. It also fails if the force you used was disproportionate to the threat. Punching someone who shoved you is more defensible than breaking their jaw over a verbal insult.
Other defenses attack the elements directly. If the injury was truly accidental or resulted from recklessness rather than awareness, the “knowingly” element doesn’t fit. Defense attorneys also challenge whether the alleged injury meets the statutory threshold at all, or whether the accuser’s account is reliable.
What a Felony Conviction Costs You Long-Term
The prison sentence and fine are the visible penalties. The lasting ones are the collateral consequences.
A felony conviction makes it illegal to possess a firearm in Missouri. Violating that prohibition is a separate Class C felony carrying up to seven years.7Missouri Revisor of Statutes. Missouri Code 571.070 – Unlawful Possession of a Firearm Federal law imposes the same ban. You also lose the right to serve on a jury and may face restrictions on professional licensing in fields like healthcare, education, and law enforcement.
Most significant of all: Missouri law explicitly excludes felony assault convictions from expungement.8Missouri Revisor of Statutes. Missouri Code 610.140 – Expungement of Certain Records Many other felonies become eligible for record-clearing after seven years. A third-degree assault conviction stays on your record permanently and will show up on background checks for employment, housing, and education for the rest of your life.
How This Compares to First- and Second-Degree Assault
Missouri’s assault statutes run on a sliding scale tied to the seriousness of the injury, the dangerousness of the method, and the mental state involved. Knowing where third-degree sits helps explain why prosecutors sometimes charge one degree over another, and why plea deals often land at this level.
First-degree assault requires either an attempt to kill or knowingly causing (or attempting to cause) serious physical injury, which is a much higher threshold than the “physical injury” required for third-degree.9Missouri Revisor of Statutes. Missouri Code 565.050 – Assault in the First Degree The baseline is a Class B felony (five to fifteen years), rising to a Class A felony (ten to thirty years or life) if the victim actually suffers serious physical injury or is a special victim.
Second-degree assault covers the middle ground: causing physical injury with a deadly weapon or dangerous instrument, recklessly causing serious physical injury, causing injury by recklessly firing a gun, or attempting to kill under sudden passion from adequate cause.10Missouri Revisor of Statutes. Missouri Code 565.052 – Assault in the Second Degree It’s a Class D felony (up to seven years), bumped to a Class B felony if the victim is a special victim.
Third-degree is the catch-all for knowingly causing a non-serious injury without a weapon. When the injury is more than slight, a weapon was involved, or the conduct created a risk of death, prosecutors will reach for a higher degree. A defendant initially charged with second-degree assault often negotiates down to third-degree, which is one reason this charge appears so frequently in Missouri court records.
Statute of Limitations
Prosecutors have three years from the date of the offense to file third-degree assault charges.11Missouri Revisor of Statutes. Missouri Code 556.036 – Time Limitations That’s the standard limitations period for felonies in Missouri. Certain circumstances can pause the clock, such as the defendant leaving the state, but the three-year baseline applies to the overwhelming majority of cases. If charges aren’t filed within that window, they’re barred.
If Your Charge Predates 2017
The current statute is the product of a major overhaul. Before Missouri’s 2017 criminal code revision, third-degree assault sat under section 565.070 and covered a much broader range of conduct, including attempting to cause or recklessly causing physical injury, causing injury through criminal negligence with a deadly weapon, making someone fear imminent harm, engaging in reckless conduct creating a grave risk of death, and making offensive or provocative physical contact.12Missouri Revisor of Statutes. Missouri Code 565.070 – Assault in the Third Degree
The classification was also less severe. Most of those scenarios were Class A misdemeanors punishable by up to one year in county jail. Two of the lesser acts, making someone fear immediate harm and making offensive contact, were Class C misdemeanors carrying a maximum of fifteen days in jail. The 2017 revision narrowed the statute to a single scenario, knowingly causing physical injury, and reclassified it as a felony. Many of the old scenarios were redistributed to other assault statutes or to fourth-degree assault. Cases charged under the old law before 2017 are governed by the old classifications, but anyone charged today faces the felony version and the permanent record that comes with it.