Williamson v. Florida Department of Corrections, 805 F.3d 1009

In 1988 Williamson allegedly entered the Deckers’ home, bound and robbed occupants, fatally stabbed Donna Decker, and shot other family members; Charles Panoyan witnessed the event but initially withheld the assailant’s identity out of fear.
Panoyan later identified Williamson, testifying he had been threatened by Williamson with graphic torture and death of his family; Panoyan’s delay and fear were central to credibility.
The State presented Dr. Richard Ofshe, an expert on extreme influence techniques, who testified that Panoyan’s conduct fit a pattern of terrorized victims; defense counsel declined to voir dire Ofshe or seek a Frye hearing and used Ofshe’s presence to argue the State’s weakness.
Additional inculpatory evidence included a hat resembling the killer’s, handcuff-key-bearing utility belt, rope similar to that used at the scene, and jailhouse informant testimony about Williamson’s admissions.
Williamson was convicted and sentenced to death; on collateral review Florida courts remanded to consider whether defense counsel was ineffective for not challenging Ofshe’s admissibility and ultimately held Williamson failed to show prejudice under Strickland.
The federal district court denied habeas relief; the Eleventh Circuit affirmed, finding the Florida Supreme Court reasonably applied Strickland’s prejudice prong and that excluding Ofshe’s testimony would not have produced a reasonable probability of a different outcome.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether counsel was ineffective for failing to challenge Ofshe’s expert testimony	Williamson: counsel was deficient for not seeking a Frye hearing/voir dire to exclude Ofshe	State: counsel made a tactical decision; even if deficient, no prejudice	Court: did not reach deficiency; affirmed state court holding that Williamson failed to prove Strickland prejudice
Whether the Florida Supreme Court applied an improper, outcome‑determinative test	Williamson: state court required exclusion to change result (impermissibly outcome‑determinative)	State: court applied Strickland’s reasonable‑probability standard	Held: Florida court applied Strickland correctly; not outcome‑determinative
Whether Ofshe’s testimony inherently undermined confidence in the verdict because Panoyan’s credibility was key	Williamson: Ofshe improperly bolstered the only eyewitness and so was inherently prejudicial	State: substantial independent evidence supported conviction; other witnesses corroborated Panoyan’s fear	Held: No; Supreme Court precedent does not treat such bolstering as per se prejudicial; state court’s ruling reasonable
Whether the state‑court factual findings were unreasonable under AEDPA	Williamson: facts supporting confidence in verdict were overstated	State: numerous witnesses and physical evidence corroborated guilt and Panoyan’s fear	Held: State court’s factual determination was reasonable; no AEDPA relief warranted

Strickland v. Washington, 466 U.S. 668 (establishes two‑prong ineffective assistance standard)
Harrington v. Richter, 562 U.S. 86 (deference to state‑court decisions under AEDPA; "unreasonable application" standard)
Williams v. Taylor, 529 U.S. 362 (defines "clearly established Federal law" for §2254 review)
Frye v. United States, 293 F. 1013 (D.C. Cir.) (historical standard for admissibility of novel scientific evidence)
Jones v. GDCP Warden, 753 F.3d 1171 (11th Cir. 2014) (discusses Strickland reasonable‑probability requirement)
Reese v. Sec'y, Fla. Dep't of Corr., 675 F.3d 1277 (11th Cir. 2012) (AEDPA reasonableness review explained)
Spencer v. United States, 773 F.3d 1132 (11th Cir. 2014) (certificate of appealability requirements)
Williamson v. State, 681 So. 2d 688 (Fla. 1996) (direct appeal upholding convictions and death sentence)
Williamson v. State, 994 So. 2d 1000 (Fla. 2008) (postconviction proceedings; remand re: Ofshe testimony)
Williamson v. State, 123 So. 3d 1060 (Fla. 2013) (Florida Supreme Court denial on prejudice ground affirmed on federal habeas)