(a) A person shall be subjected to the penalty of death for a capital felony committed prior to April 25, 2012, under the provisions of section 53a-54b in effect prior to April 25, 2012, only if (1) a hearing is held in accordance with the provisions of this section, and (2) such person was eighteen years of age or older at the time the offense was committed.

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(b) For the purpose of determining the sentence to be imposed when a defendant is convicted of or pleads guilty to a capital felony, the judge or judges who presided at the trial or before whom the guilty plea was entered shall conduct a separate hearing to determine the existence of any mitigating factor concerning the defendant’s character, background and history, or the nature and circumstances of the crime, and any aggravating factor set forth in subsection (i) of this section. Such hearing shall not be held if the state stipulates that none of the aggravating factors set forth in subsection (i) of this section exists or that any factor set forth in subsection (h) of this section exists. Such hearing shall be conducted (1) before the jury that determined the defendant’s guilt, or (2) before a jury impaneled for the purpose of such hearing if (A) the defendant was convicted upon a plea of guilty; (B) the defendant was convicted after a trial before three judges as provided in subsection (b) of section 53a-45; or (C) if the jury that determined the defendant’s guilt has been discharged by the court for good cause, or (3) before the court, on motion of the defendant and with the approval of the court and the consent of the state.

(c) In such hearing the court shall disclose to the defendant or his counsel all material contained in any presentence report that may have been prepared. No presentence information withheld from the defendant shall be considered in determining the existence of any mitigating or aggravating factor. Any information relevant to any mitigating factor may be presented by either the state or the defendant, regardless of its admissibility under the rules governing admission of evidence in trials of criminal matters, but the admissibility of information relevant to any of the aggravating factors set forth in subsection (i) of this section shall be governed by the rules governing the admission of evidence in such trials. The state and the defendant shall be permitted to rebut any information received at the hearing and shall be given fair opportunity to present argument as to the adequacy of the information to establish the existence of any mitigating or aggravating factor. The burden of establishing any of the aggravating factors set forth in subsection (i) of this section shall be on the state. The burden of establishing any mitigating factor shall be on the defendant.

(d) In determining whether a mitigating factor exists concerning the defendant’s character, background or history, or the nature and circumstances of the crime, pursuant to subsection (b) of this section, the jury or, if there is no jury, the court shall first determine whether a particular factor concerning the defendant’s character, background or history, or the nature and circumstances of the crime, has been established by the evidence, and shall determine further whether that factor is mitigating in nature, considering all the facts and circumstances of the case. Mitigating factors are such as do not constitute a defense or excuse for the capital felony of which the defendant has been convicted, but which, in fairness and mercy, may be considered as tending either to extenuate or reduce the degree of his culpability or blame for the offense or to otherwise constitute a basis for a sentence less than death.

(e) The jury or, if there is no jury, the court shall return a special verdict setting forth its findings as to the existence of any factor set forth in subsection (h) of this section, the existence of any aggravating factor or factors set forth in subsection (i) of this section and whether any aggravating factor or factors outweigh any mitigating factor or factors found to exist pursuant to subsection (d) of this section.

(f) If the jury or, if there is no jury, the court finds that (1) none of the factors set forth in subsection (h) of this section exist, (2) one or more of the aggravating factors set forth in subsection (i) of this section exist, and (3) (A) no mitigating factor exists or (B) one or more mitigating factors exist but are outweighed by one or more aggravating factors set forth in subsection (i) of this section, the court shall sentence the defendant to death.

(g) If the jury or, if there is no jury, the court finds that (1) any of the factors set forth in subsection (h) of this section exist, or (2) none of the aggravating factors set forth in subsection (i) of this section exists, or (3) one or more of the aggravating factors set forth in subsection (i) of this section exist and one or more mitigating factors exist, but the one or more aggravating factors set forth in subsection (i) of this section do not outweigh the one or more mitigating factors, the court shall impose a sentence of life imprisonment without the possibility of release.

(h) The court shall not impose the sentence of death on the defendant if the jury or, if there is no jury, the court finds by a special verdict, as provided in subsection (e) of this section, that at the time of the offense (1) the defendant was a person with intellectual disability, as defined in section 1-1g, or (2) the defendant’s mental capacity was significantly impaired or the defendant’s ability to conform the defendant’s conduct to the requirements of law was significantly impaired but not so impaired in either case as to constitute a defense to prosecution, or (3) the defendant was criminally liable under sections 53a-8, 53a-9 and 53a-10 for the offense, which was committed by another, but the defendant’s participation in such offense was relatively minor, although not so minor as to constitute a defense to prosecution, or (4) the defendant could not reasonably have foreseen that the defendant’s conduct in the course of commission of the offense of which the defendant was convicted would cause, or would create a grave risk of causing, death to another person.

(i) The aggravating factors to be considered shall be limited to the following: (1) The defendant committed the offense during the commission or attempted commission of, or during the immediate flight from the commission or attempted commission of, a felony and the defendant had previously been convicted of the same felony; or (2) the defendant committed the offense after having been convicted of two or more state offenses or two or more federal offenses or of one or more state offenses and one or more federal offenses for each of which a penalty of more than one year imprisonment may be imposed, which offenses were committed on different occasions and which involved the infliction of serious bodily injury upon another person; or (3) the defendant committed the offense and in such commission knowingly created a grave risk of death to another person in addition to the victim of the offense; or (4) the defendant committed the offense in an especially heinous, cruel or depraved manner; or (5) the defendant procured the commission of the offense by payment, or promise of payment, of anything of pecuniary value; or (6) the defendant committed the offense as consideration for the receipt, or in expectation of the receipt, of anything of pecuniary value; or (7) the defendant committed the offense with an assault weapon, as defined in section 53-202a; or (8) the defendant committed the offense set forth in subdivision (1) of section 53a-54b to avoid arrest for a criminal act or prevent detection of a criminal act or to hamper or prevent the victim from carrying out any act within the scope of the victim’s official duties or to retaliate against the victim for the performance of the victim’s official duties.