Michael Anthony Tanzi v. State of Florida, 251 So. 3d 805

Michael A. Tanzi was convicted (via guilty plea) of first-degree murder and other offenses for the abduction, sexual battery, robbery, and strangulation of Janet Acosta; the jury unanimously recommended death and the trial court imposed death.
On direct appeal and initial postconviction review the convictions and death sentence were affirmed.
Tanzi filed a successive Rule 3.851 motion asserting Hurst-based error (that the jury, not the judge, must find the facts necessary to impose death) and related claims including a Caldwell challenge and requests to revisit prior denied claims.
The Florida Supreme Court agreed Hurst applies retroactively to Tanzi’s case but analyzed whether the Hurst error was harmless beyond a reasonable doubt.
The court concluded the Hurst error was harmless because the jury had unanimously recommended death and had effectively found the necessary facts; it rejected the mercy‑instruction/Caldwell and claim‑revisit arguments, and affirmed denial of postconviction relief.
Justice Quince dissented, arguing Hurst error cannot be harmless where the jury did not make the specific factual findings Hurst requires for certain aggravators.

Issue	Plaintiff's Argument (Tanzi)	Defendant's Argument (State)	Held
Applicability of Hurst	Hurst error applies and requires relief	Hurst applies but may be harmless here	Court: Hurst applies (Mosley) but error is harmless beyond a reasonable doubt
Harmless‑error analysis	Hurst error not harmless because jury did not make required specific findings; absence of mercy instruction undermines reliability	Jury’s unanimous death recommendation shows it found necessary facts; lack of mercy instruction does not make error non‑harmless	Court: Harmless beyond a reasonable doubt; mercy‑instruction argument rejected
Caldwell claim (jury misled about role of mercy)	Hurst‑induced Caldwell error requires relief	No Caldwell violation warranting relief	Court: Caldwell claim rejected (followed Reynolds)
Revisit previously denied postconviction claims after Hurst/Perry	Change in law warrants revisiting earlier denied claims	No entitlement to revisiting prior denied claims based on Hurst/Perry	Court: Rejects entitlement to revisit prior denied claims

Tanzi v. State, 964 So.2d 106 (Fla. 2007) (direct appeal affirming convictions and death sentence)
Hurst v. Florida, 136 S.Ct. 616 (U.S. 2016) (jury, not judge, must find facts necessary for death sentence)
Hurst v. State, 202 So.3d 40 (Fla. 2016) (Florida application of Hurst)
Mosley v. State, 209 So.3d 1248 (Fla. 2016) (Hurst retroactivity and applicability guidance)
Davis v. State, 207 So.3d 142 (Fla. 2016) (harmless‑error analysis where unanimous jury recommendation is dispositive)
Knight v. State, 225 So.3d 661 (Fla. 2017) (addressing mercy‑instruction arguments post‑Hurst)
Caldwell v. Mississippi, 472 U.S. 320 (U.S. 1985) (juror misapprehension of role of sentencing authority can violate due process)