Conspiracy to murder is a standalone federal and state crime built on an agreement between two or more people to kill someone, combined with at least one concrete step toward carrying that plan out. Under 18 U.S.C. § 1117, a conviction can carry any prison term up to life, even if the intended victim is never harmed.1Office of the Law Revision Counsel. 18 USC 1117 – Conspiracy to Murder The charge exists precisely so prosecutors can intervene before a killing happens, which is why the elements, the exposure, and the defenses all look different from what people expect.
What the Prosecution Has to Prove
Three elements have to be established beyond a reasonable doubt: an agreement, criminal intent, and an overt act.
An Agreement
Two or more people must reach a mutual understanding to kill someone. Nothing has to be written or even spoken outright. Courts routinely infer agreements from coordinated movements, shared communications, pooled money, or parallel actions that only make sense if the parties were working together toward the same unlawful death.
Federal law requires a bilateral agreement, meaning both sides genuinely intend to go through with it. If the other “conspirator” turns out to be an undercover officer who never intended to commit murder, there is no true conspiracy under federal doctrine. Some states following the Model Penal Code allow prosecution even when one party was faking; the federal system does not.
Knowing about a plot, sitting in on a conversation about it, or nodding along without agreeing to take part is not enough.
Intent
Conspiracy to murder requires two layers of intent. The defendant must knowingly enter the agreement, and must also specifically intend for the murder to happen.2U.S. Courts (Third Circuit). Chapter 6 Final Instructions – Elements of Offenses Conspiracy 18 USC 371 Someone who signs on to what they believe is a robbery, unaware that a killing is part of the plan, lacks the second layer.
Because intent lives inside a person’s head, prosecutors build it from text messages, recorded calls, cooperator testimony, and patterns of preparation. A vague remark like “someone should take care of him” rarely stands alone, but paired with weapon purchases, surveillance, or travel to the target’s location, it becomes serious evidence.
An Overt Act
Federal conspiracy-to-murder law requires at least one overt act: a concrete step taken by any member of the conspiracy in furtherance of the plan.1Office of the Law Revision Counsel. 18 USC 1117 – Conspiracy to Murder The act does not have to be illegal on its own. Buying a map, renting a car, opening a bank account, or making a phone call can all qualify if they move the plot forward. Only one conspirator needs to perform the act, and it binds everyone in the agreement. Most states impose a similar requirement, though a handful allow conviction on the agreement alone.
What the Sentence Looks Like
The federal statute authorizes imprisonment for any term of years up to life.1Office of the Law Revision Counsel. 18 USC 1117 – Conspiracy to Murder The death penalty is not available for the conspiracy charge itself, even though it can be for the completed murder under 18 U.S.C. § 1111.3Office of the Law Revision Counsel. 18 USC 1111 – Murder
Federal sentencing guidelines set a base offense level of 33 for conspiracy or solicitation to commit murder, which produces a range of roughly 135 to 168 months (about 11 to 14 years) for a defendant with no criminal history.4United States Sentencing Commission. USSG 2A1.5 – Conspiracy or Solicitation to Commit Murder Two adjustments commonly push it higher:
- If money or anything of value changed hands for the killing (murder for hire), the offense level increases by four.
- If the conspiracy actually caused a death, the court applies the first-degree murder guideline instead, where life becomes the expected outcome.
State penalties vary. Some states treat conspiracy to murder as equivalent to the underlying murder charge and impose the same sentencing range; others set it somewhat lower. Either way, the exposure is a long prison term. And because conspiracy is a separate offense that does not merge with the completed crime, a defendant who ultimately kills the victim can be convicted and sentenced for both.
Liability for What Your Co-Conspirators Do
Joining a conspiracy exposes you to crimes committed by other members, even ones you had no hand in. Under Pinkerton liability, a conspirator is vicariously responsible for any offense committed by another member if that offense was in furtherance of the conspiracy and reasonably foreseeable.5Cornell Law School. Pinkerton Liability
The practical consequence is severe. Join a plan to kill one person, and if a co-conspirator kills a bystander during the attempt, you can be charged with that death too. The government only has to show that a reasonable person in your position could have anticipated that kind of violence. Not every state applies Pinkerton, but federal courts do so consistently. People whose actual role was small, such as driving a car or relaying a message, have been sentenced for murders they never intended.
How Prosecutors Build the Case
Conspiracy is invisible by nature. There is rarely a recording of two people shaking hands on a killing, so cases get built in layers.
Direct evidence includes intercepted calls, texts, emails, confessions, and testimony from cooperators or informants. A single recorded conversation covering how and when to kill the target can carry both the agreement and the intent. Circumstantial evidence fills the rest: patterns of association, unexplained cash, weapon or surveillance-gear purchases, internet searches into the victim’s routine, and travel near the target. Prosecutors do not have to prove that every conspirator knew every detail. They have to show each defendant was aware of the plot’s central goal and voluntarily took part.
One rule tilts the field toward the government. Under Federal Rule of Evidence 801(d)(2)(E), a statement made by a co-conspirator during and in furtherance of the conspiracy is admissible against every member, not just the person who said it.6Cornell Law School. Federal Rules of Evidence Rule 801 – Definitions That Apply to This Article, Exclusions from Hearsay So a remark like “we’re planning to take out the witness next Tuesday,” said to a third party, can be used against everyone in the plot. The statement alone cannot prove the conspiracy, but it becomes potent alongside other evidence.
Defenses That Can Work
None of these is easy, but each is recognized.
Withdrawal
A defendant who left the conspiracy before any overt act may avoid conviction entirely. Withdrawal takes more than losing interest. It requires a definite, affirmative step inconsistent with the conspiracy’s purpose, plus reasonable efforts to communicate the break to the other members.7Ninth Circuit District and Bankruptcy Courts. 8.24 Withdrawal From Conspiracy Some courts also accept a “clean breast” to law enforcement.8United States Department of Justice Archives. 652 Statute of Limitations for Conspiracy
The burden shifts here. Once the government shows the defendant was in the conspiracy, the defendant has to prove withdrawal by a preponderance of the evidence. Timing matters: if any member has already committed an overt act, walking away afterward may cut off future liability but does not erase the original conspiracy charge.
Entrapment
Entrapment applies when the government induced someone to join a conspiracy they would not have joined on their own. Two elements have to be met. The government must have gone beyond offering an opportunity and actually pressured or persuaded the defendant into the crime, and the defendant must have lacked any predisposition to commit murder.9United States Department of Justice Archives. Entrapment – Elements Predisposition is the harder half. A defendant who jumped at the chance, or whose history suggests a willingness to use violence, will lose the defense even when undercover agents or informants set the plot in motion.
Renunciation
Under the Model Penal Code, followed by many states, renunciation is an affirmative defense requiring the defendant not just to abandon the conspiracy but to actively thwart the murder from happening. Walking away is not enough. This bar is higher than withdrawal, which asks only for disassociation, not prevention.
How It Differs From Solicitation and Attempted Murder
These charges get confused, and they should not be.
Solicitation is asking, encouraging, or commanding another person to commit a murder. The other person does not have to agree. Offer someone money to kill your business partner, and if they refuse on the spot, you have committed solicitation but not conspiracy. If they say yes and planning begins, it becomes conspiracy.
Attempted murder focuses on one person’s direct actions toward a killing. It requires a substantial step toward the murder itself, such as firing a weapon at the victim, and does not require any agreement with anyone else. Conspiracy punishes the plan; attempt punishes the try. A defendant can be charged with both if the plot advances far enough.
How Long Prosecutors Have to Bring Charges
Because conspiracy to murder under federal law is not punishable by death, the general five-year statute of limitations applies.10United States Department of Justice Archives. 650 Length of Limitations Period The clock starts when the conspiracy ends, measured by the date of the last overt act in furtherance of the plot.8United States Department of Justice Archives. 652 Statute of Limitations for Conspiracy A conspiracy that stays active through continued planning or preparation can keep that window open for years past the initial agreement.
For an individual defendant, the clock starts when that person personally withdraws, not when the last group act occurs. Walk away in January, and your five-year window runs from January, even if co-conspirators keep acting through December. Staying attached to a live conspiracy, even passively, means the limitations clock keeps resetting with every new overt act any member takes.