Sec. 53a-54a. Murder. (a) A person is guilty of murder when, with intent to cause the death of another person, he causes the death of such person or of a third person or causes a suicide by force, duress or deception; except that in any prosecution under this subsection, it shall be an affirmative defense that the defendant committed the proscribed act or acts under the influence of extreme emotional disturbance for which there was a reasonable explanation or excuse, the reasonableness of which is to be determined from the viewpoint of a person in the defendant’s situation under the circumstances as the defendant believed them to be, provided nothing contained in this subsection shall constitute a defense to a prosecution for, or preclude a conviction of, manslaughter in the first degree or any other crime.
(b) Evidence that the defendant suffered from a mental disease, mental defect or other mental abnormality is admissible, in a prosecution under subsection (a) of this section, on the question of whether the defendant acted with intent to cause the death of another person.
(c) Murder is punishable as a class A felony in accordance with subdivision (2) of section 53a-35a unless it is (1) a capital felony committed prior to April 25, 2012, by a person who was eighteen years of age or older at the time of the offense, punishable in accordance with subparagraph (A) of subdivision (1) of section 53a-35a, (2) murder with special circumstances committed on or after April 25, 2012, by a person who was eighteen years of age or older at the time of the offense, punishable as a class A felony in accordance with subparagraph (B) of subdivision (1) of section 53a-35a, or (3) murder under section 53a-54d committed by a person who was eighteen years of age or older at the time of the offense.
Sec. 53a-54b. Murder with special circumstances. A person is guilty of murder with special circumstances who is convicted of any of the following and was eighteen years of age or older at the time of the offense: (1) Murder of a member of the Division of State Police within the Department of Emergency Services and Public Protection or of any local police department, a chief inspector or inspector in the Division of Criminal Justice, a state marshal who is exercising authority granted under any provision of the general statutes, a judicial marshal in performance of the duties of a judicial marshal, a constable who performs criminal law enforcement duties, a special policeman appointed under section 29-18, a conservation officer or special conservation officer appointed by the Commissioner of Energy and Environmental Protection under the provisions of section 26-5, an employee of the Department of Correction or a person providing services on behalf of said department when such employee or person is acting within the scope of such employee’s or person’s employment or duties in a correctional institution or facility and the actor is confined in such institution or facility, or any firefighter, while such victim was acting within the scope of such victim’s duties; (2) murder committed by a defendant who is hired to commit the same for pecuniary gain or murder committed by one who is hired by the defendant to commit the same for pecuniary gain; (3) murder committed by one who has previously been convicted of intentional murder or of murder committed in the course of commission of a felony; (4) murder committed by one who was, at the time of commission of the murder, under sentence of life imprisonment; (5) murder by a kidnapper of a kidnapped person during the course of the kidnapping or before such person is able to return or be returned to safety; (6) murder committed in the course of the commission of sexual assault in the first degree; (7) murder of two or more persons at the same time or in the course of a single transaction; or (8) murder of a person under sixteen years of age.
Sec. 53a-54c. Felony murder. A person is guilty of murder when, acting either alone or with one or more persons, such person commits or attempts to commit robbery, home invasion, burglary, kidnapping, sexual assault in the first degree, aggravated sexual assault in the first degree, sexual assault in the third degree, sexual assault in the third degree with a firearm, escape in the first degree, or escape in the second degree and, in the course of and in furtherance of such crime or of flight therefrom, such person, or another participant, if any, causes the death of a person other than one of the participants, except that in any prosecution under this section, in which the defendant was not the only participant in the underlying crime, it shall be an affirmative defense that the defendant: (1) Did not commit the homicidal act or in any way solicit, request, command, importune, cause or aid the commission thereof; and (2) was not armed with a deadly weapon, or any dangerous instrument; and (3) had no reasonable ground to believe that any other participant was armed with such a weapon or instrument; and (4) had no reasonable ground to believe that any other participant intended to engage in conduct likely to result in death or serious physical injury.
Sec. 53a-54d. Arson murder. A person is guilty of murder when, acting either alone or with one or more persons, he commits arson and, in the course of such arson, causes the death of a person. Notwithstanding any other provision of the general statutes, any person convicted of murder under this section who was eighteen years of age or older at the time of the offense shall be punished by life imprisonment and shall not be eligible for parole.