What Is the Difference Between First-Degree & Second-Degree Murder?
There are two primary degrees of murder:
First-Degree Murder
A person commits first-degree murder by knowingly causing the death of another person after deliberation upon the matter (RSMo § 565.020). This Class A felony carries death or life imprisonment without probation or parole.
Second-Degree Murder
A person commits second-degree murder by knowingly causing a death without deliberation or while committing or attempting to commit another felony offense. This Class A felony carries 10–30 years or life in prison (RSMo § 565.021).
Understanding Murder vs. Manslaughter
Both murder and manslaughter charges involve the loss of life, but these offenses are treated differently under the law. The key difference comes down to your state of mind during the incident.
Murder is pursued when a person acts knowingly or with calculated premeditation. Manslaughter is typically charged when a death results from recklessness or the influence of “sudden passion” arising from adequate cause (RSMo § 565.023), meaning a reasonable person would have been provoked into acting without thinking.
If you’re facing a murder charge, the prosecution is trying to prove you had a malicious, conscious intent to kill. Our defense team works to deconstruct assumptions about mindset and downgrade murder charges to lesser manslaughter charges when possible to protect clients from the death penalty.
Missouri's Felony Murder Rule
One of the most misunderstood aspects of Missouri murder law is that a person can face a second-degree murder charge without ever intending to kill anyone. Under Missouri's felony murder rule, a death that occurs during the commission of certain underlying felonies, such as robbery, burglary, or kidnapping, can result in a murder charge against everyone involved in that felony, regardless of who actually caused the death or whether it was accidental.
This means a getaway driver, lookout, or accomplice who never touched a weapon can face the same murder charge as the person directly responsible for a death. Because felony murder charges depend entirely on proving participation in the underlying felony, our attorneys focus heavily on challenging the state's evidence of a defendant's actual role and level of involvement, which can be the key to avoiding a murder conviction altogether.
How Missouri's Capital Sentencing Process Works
When the death penalty is on the table in a first-degree murder case, Missouri law requires a separate sentencing phase after a guilty verdict, often called the penalty phase. During this stage, the same jury that determined guilt hears additional evidence before deciding between the death penalty and life imprisonment without parole.
The jury must weigh statutory aggravating factors, such as whether the murder was committed for financial gain or involved torture, against mitigating factors the defense presents, which can include a defendant's mental health history, lack of prior criminal record, age, or difficult personal background. Missouri law requires the jury to unanimously find at least one aggravating factor beyond a reasonable doubt before the death penalty can even be considered, giving skilled defense counsel a critical opportunity to prevent that threshold from being met.
Because this phase can be just as consequential as the trial itself, our attorneys begin building mitigation evidence, including personal history, mental health evaluations, and expert testimony, from the earliest stages of a capital case rather than waiting until after a conviction.
Bail in Murder Cases: What Defendants Should Know
Unlike most criminal charges, murder cases in Missouri carry a strong presumption against bail. Under the Missouri Constitution, defendants charged with certain capital offenses may be denied bail entirely when the proof is evident or the presumption of guilt is strong, leaving many murder defendants in pretrial detention for the full length of their case, which can stretch well beyond a year.
When bail is available, courts typically impose the strictest possible conditions, including high monetary bonds, electronic monitoring, and travel restrictions. Because being released pretrial can significantly affect a defendant's ability to assist in preparing their own defense, our attorneys aggressively pursue every available legal avenue to argue for bail eligibility at the earliest possible hearing, including challenging the strength of the state's initial evidence.
Can a Minor Face the Death Penalty in a First-Degree Murder Case?
No. The death penalty in first-degree murder cases can only be applied if the defendant was 18 years of age or older at the time the offense was committed. If a defendant is under 18, the state is legally prohibited from seeking the death penalty.
Under RSMo § 565.033, the harshest possible penalty for a juvenile murder conviction is life without the eligibility for probation or parole. Other potential outcomes include life imprisonment with the possibility of parole or 30–40 years in prison.
When determining penalties, the judge or jury is legally required to consider mitigating factors, such as the defendant’s age, maturity level, intellectual capacity, background, and the influence of peer or familial pressure.
While the death penalty is off the table, facing life in prison is still a catastrophic outcome for teenagers and young adults. We fight relentlessly for rehabilitation and other alternatives when possible to limit the long-term impacts on a young person’s life.
How Do Prosecutors Prove “Intent to Kill” in Murder Cases?
Proving what was inside a person’s head during a fatal incident is one of the highest hurdles for the prosecution. In first-degree murder cases, the prosecution often relies on circumstantial evidence to prove an intent to kill. The state will analyze your actions leading up to, during, and immediately after the event to build a case against you.
Investigators focus on factors like the type of weapon involved, the specific location and severity of the fatal injuries, and any prior arguments or text messages between you and the deceased. For example, the prosecution may argue that simply using a dangerous instrument during an altercation automatically implies a conscious intent.
Our defense attorneys understand that human reactions in high-stress environments are rarely that simple. We contest unfounded assumptions by exposing missing context ignored by police and challenging subjective interpretations of your mindset.
How Our Trial Attorneys Dismantle Murder Allegations
Law enforcement officers often rush to conclusions in homicide investigations, building a narrative based on flawed witness statements and assumptions rather than objective facts. At Benjamin Law Firm, LLC, we conduct comprehensive, independent investigations to dismantle the prosecution's claims:
- Asserting Self-Defense & Defense of Others (RSMo § 563.031): Under Missouri’s Stand Your Ground and Castle Doctrine statutes, you have the legal right to use force—including deadly force—if you reasonably believe it is necessary to protect yourself or another person from imminent death, serious physical injury, or a forcible felony. We file pre-trial motions to establish complete statutory immunity.
- Downgrading Murder to Manslaughter: If a fatality occurred in the heat of passion or due to sudden provocation, the act does not constitute murder under Missouri law. We present evidence of "sudden passion arising from adequate cause" to successfully downgrade murder charges to voluntary or involuntary manslaughter, removing the death penalty or life sentences from the table.
- Exposing Forensics & Ballistics Errors: Forensic science is only as reliable as the people performing the testing. We partner with independent forensic toxicologists, DNA experts, and ballistics specialists to audit crime scene evidence, chain-of-custody protocols, and state lab findings.
- Exposing Unreliable Witness Identification & Alibis: Eyewitness memory is deeply flawed. We scrutinize police lineup procedures, cross-examine state witnesses for bias or inconsistencies, and utilize digital forensics (such as cell tower records and surveillance feeds) to verify alibis.
- Suppressing Unconstitutionally Obtained Evidence: If law enforcement conducted illegal searches, failed to advise you of your Miranda rights, or coerced statements during interrogation, we file aggressive motions to suppress that evidence from being used at trial.
Frequently Asked Questions
Can someone be charged with murder if they didn't directly cause the death?
Yes, in certain circumstances. Under Missouri's felony murder rule, accomplices and co-participants in an underlying felony can face murder charges even if they didn't personally cause the fatal injury.
Is there a difference between "murder" and "capital murder" in Missouri?
Missouri does not use the term "capital murder" as a separate charge. Instead, first-degree murder is the charge that can carry the death penalty, depending on the presence of statutory aggravating factors and the defendant's age at the time of the offense.
How long does a murder case typically take to go to trial?
Murder cases, particularly those involving the possibility of the death penalty, often take significantly longer than other criminal matters due to the volume of evidence, expert testimony, and pretrial motions involved. It's common for these cases to take one to two years, or longer, to reach trial.
Can a murder charge be reduced through a plea agreement?
In some cases, yes. Depending on the strength of the evidence, a first-degree murder charge may be negotiated down to second-degree murder or manslaughter, which can significantly reduce sentencing exposure and, in first-degree cases, take the death penalty off the table entirely.
Defending Against High-Stakes Murder Charges Since 2002
A murder conviction can threaten your life, making high-quality legal representation absolutely vital to avoiding the death penalty and other severe consequences. If you’re facing a murder or homicide charge, our lawyers are ready to deliver the tenacious defense you deserve. Our trial-ready approach and proven results make us uniquely equipped to defend your rights at each stage of the criminal proceedings.
Facing a murder charge can be frightening, but you don’t have to fight it alone. Contact us online to discuss your case. Our legal team is available 24/7 to take your call.2Asxw
“This firm is very patient, courteous and professional.”“I am very satisfied with services rendered and would recommend to anyone with moving violations.”- Christopher W.
