What are the facts?
Keeler, who was estranged from his pregnant wife, confronted her while she was driving on a rural road. Upon learning and believing that the fetus she was carrying was fathered by another man, Keeler forced open the car door, struck his wife, and intentionally drove his knee into her abdomen, stating in substance that he would "stomp it out of you." Medical evidence established that the fetus was viable—approximately eight months gestation—and that the trauma caused a crushed skull and death of the fetus before delivery. The mother later underwent an emergency Caesarean section, and the fetus was delivered stillborn, showing no signs of having ever breathed. The State charged Keeler with murder under California Penal Code section 187. Keeler sought extraordinary relief to prevent the superior court from trying him for murder, arguing that, as a matter of law, an unborn fetus was not a "human being" within the meaning of section 187 at the time of the alleged offense.
What is the legal issue?
Does California Penal Code section 187's use of the term "human being" encompass an unborn yet viable fetus such that the intentional killing of that fetus constitutes murder under the statute as it existed prior to the 1970 amendment?
What rule applies?
Under the pre-1970 version of California Penal Code section 187, "murder" was defined as the unlawful killing of a "human being" with malice aforethought. Construed in light of the common law and settled legislative usage, a "human being" for homicide purposes is one who has been born alive; an unborn fetus is not included. Penal statutes are construed strictly under the rule of lenity, and due process forbids retroactive judicial enlargement of a criminal statute in a manner that deprives a defendant of fair warning (Bouie v. City of Columbia). Any expansion of criminal liability beyond the statute's fair import is for the Legislature, not the courts.
What did the court hold?
No. An unborn but viable fetus was not a "human being" under Penal Code section 187 as it then existed. The California Supreme Court granted a peremptory writ prohibiting the superior court from proceeding with the murder charge.
What is the reasoning?
1) Common law and statutory history: The court traced California's homicide statute to the common law, which adhered to the "born alive" rule—homicide requires the killing of one who has been born alive. Because the Legislature adopted section 187 using this common law terminology and repeatedly amended homicide-related statutes without altering the term "human being," the court inferred legislative acquiescence in the traditional definition. The court declined to read "human being" to include a fetus absent explicit legislative direction. 2) Canons of construction and lenity: Penal statutes are strictly construed. Where ambiguity exists, courts resolve doubts in favor of the defendant. The state's invitation to extend "human being" to cover viable fetuses implicated a substantial expansion of criminal liability. The court emphasized that any such extension should be made explicitly by the Legislature. 3) Due process and fair warning: Relying on Bouie v. City of Columbia, the court reasoned that an unforeseen and retroactive judicial enlargement of a criminal statute violates due process by depriving a defendant of fair notice. Even if modern medical advances made it tempting to equate a viable fetus with a person for moral or policy reasons, reinterpreting "human being" to include a fetus would constitute an unforeseeable construction. Applying that construction to Keeler would be constitutionally impermissible. 4) Rejection of state's viability argument and policy appeals: The state urged that a viable fetus is functionally a person and that public policy supports homicide liability. The court acknowledged the policy force of the argument but held that courts cannot rewrite penal statutes to reach perceived gaps. The appropriate forum for such policy change is the Legislature. Indeed, the Legislature promptly amended section 187 after the decision to add "or a fetus" (with specified exceptions), confirming the court's separation-of-powers analysis. 5) Other offenses preserved: The court noted that its decision did not immunize Keeler from criminal liability for other offenses arising from the assault on the mother (e.g., assault or battery). It held only that, under the statute then in effect, murder of a "human being" did not reach the killing of an unborn fetus.
Why is this case significant?
Keeler is a leading case on statutory interpretation in criminal law and the constitutional limits on judicial expansion of penal statutes. It illustrates the born-alive rule's historical role, the rule of lenity, and the due process fair-warning principle that functions like an ex post facto restraint on courts. The decision catalyzed legislative reform: California amended Penal Code section 187 in 1970 to explicitly include the unlawful killing of a fetus (subject to exceptions), and later cases clarified that viability is not required under the amended statute. For law students, Keeler is essential for understanding how courts balance textual fidelity, historical meaning, policy considerations, and constitutional notice in defining the scope of criminal liability.
Did Keeler hold that killing a viable fetus can never be murder in California?
No. Keeler interpreted the pre-1970 version of Penal Code section 187 and held that, as then written, "human being" did not include an unborn fetus. Shortly after Keeler, the Legislature amended section 187 to add "or a fetus," making the unlawful killing of a fetus murder (with specific statutory exceptions). Thus, after the amendment, fetal homicide can be murder in California.
Why didn't the court adopt a "viability" standard judicially?
The court emphasized statutory text and history, the rule of lenity, and due process fair-warning concerns. It concluded that adopting a viability standard would be an unforeseen enlargement of criminal liability, violating due process if applied retroactively. The court further reasoned that line-drawing on complex policy matters (e.g., viability) is a legislative function.
What constitutional principle limited the court's ability to expand the statute?
Due process fair-warning, as articulated in Bouie v. City of Columbia, bars retroactive judicial enlargement of a criminal statute that is unforeseeable at the time of the defendant's conduct. Although the federal Ex Post Facto Clause directly binds legislatures, Bouie applies a similar restraint to courts via due process.
What charges, if any, could still be brought against Keeler after this decision?
Keeler could still face charges related to the assault on the mother, such as assault or battery, and potentially aggravated forms depending on the evidence. The writ barred only the murder prosecution for the death of the fetus under section 187 as it existed at the time.
How did the Legislature respond to Keeler?
In 1970, the California Legislature amended Penal Code section 187 to define murder as the unlawful killing of a "human being, or a fetus," while creating exceptions (e.g., for lawful abortions and acts necessary to preserve the mother's life). Subsequent case law has clarified that the amended statute does not require fetal viability.
What interpretive methods did the court rely on?
The court relied on (1) common law background and the born-alive rule, (2) legislative history and acquiescence, (3) the rule of lenity requiring narrow construction of penal statutes, and (4) constitutional due process limits on retroactive judicial expansion.