Tryon v. Carpenter, 5:19-cv-00195

Background

Petitioner Isaiah Tryon was convicted in Oklahoma of first‑degree murder for stabbing his ex‑girlfriend; jury found four aggravators and sentenced him to death. Trial evidence included surveillance video, witnesses, autopsy, and a recorded confession.
Trial counsel presented mitigation testimony (psychological experts, family witnesses) including a low WAIS‑IV IQ (68) and history of head injuries; a prior IQ score of 81 existed. Trial court denied an Atkins (intellectual disability) inquiry and other defense requests.
On direct appeal the Oklahoma Court of Criminal Appeals (OCCA) affirmed; one aggravator was later invalidated but the court reweighed and left the death sentence intact. Post‑conviction applications were denied; a successive application raised additional claims and was also denied.
Tryon filed a federal habeas petition under 28 U.S.C. § 2254 asserting (inter alia) ineffective assistance of counsel, evidentiary/exclusion errors at sentencing, insufficient evidence for the HAC aggravator, juror misconduct, and cumulative error. District Court reviewed the state record under AEDPA and denied relief.
The court applied AEDPA deference to OCCA rulings, found many claims procedurally barred, and held that adjudicated claims were not unreasonable applications of clearly established Supreme Court law (Strickland, Jackson, Lockett, etc.).

Issues

Issue	Tryon’s Argument	State’s Argument	Held
(1) Systemic counsel defects / procedural default	OCPDO structure and funding prevented effective, separate trial/appellate representation; excuses default	OCCA procedural bar (Okla. Stat. tit. 22 §1089) is adequate and independent; no cause/prejudice shown	Procedural bar enforced; claim denied (Tenth Circuit precedent supports adequacy)
(2) Failure to pursue Atkins (intellectual disability)	Counsel should have challenged Oklahoma’s IQ‑cutoff statute and investigated/presented ID evidence (IQ 68 + deficits)	State relied on statutory 76‑point bright line and defense expert testimony that Tryon was not ID; OCCA reasonably denied claim	Denied: OCCA adjudication reasonable under AEDPA and Strickland; no clear Supreme Court precedent compels different result
(3) Failure to develop brain injury / TBI evidence and neuroimaging	Counsel should have obtained neuroimaging and more TBI/suicide/headbanging evidence for mitigation	OCCA: additional evidence would be cumulative; no showing what scan would reveal; no Strickland prejudice	Denied: OCCA’s fact/findings reasonable; speculative benefits insufficient to show prejudice
(4) Exclusion of hearsay mitigation through expert (limits on mitigation)	Exclusion violated Lockett/Chambers by preventing consideration of father’s violence	Trial court excluded expert repetition of prior statements as hearsay and cumulative; other firsthand testimony presented	Denied: OCCA reasonably applied due‑process plain‑error analysis; defendant still presented ample mitigation testimony
(5) Denial of intoxication and lesser‑included (2d degree) instructions	Evidence of multi‑day substance use, blackout, and mental deficits warranted intoxication and lesser‑included instruction	Record showed detailed, lucid confession, coherent behavior post‑arrest; no evidence of inability to form intent or utter incapacity	Denied: OCCA reasonably found no prima facie intoxication and no basis for second degree instruction under Beck
(6) Failure to rebut continuing‑threat evidence (jail fights)	Counsel failed to investigate/exclude jail fight records and same‑office conflict re: co‑defendant video	OCCA: proffered exculpatory disciplinary report was hearsay; state had strong continuing‑threat evidence beyond fights	Denied: no Strickland prejudice shown for 2009 fight; 2013 fight claim procedurally barred
(7) HAC aggravator vagueness and sufficiency	HAC now overbroad/vague; even as applied, insufficient conscious suffering	OCCA applied its limiting construction (torture/serious physical abuse + conscious suffering); evidence (video, wounds, witnesses, confession) supports HAC	Denied: OCCA’s narrowing and sufficiency findings were reasonable under Jackson and AEDPA
(8) Juror misconduct / failure to remove jurors	Jurors discussed case outside court; mistrial or removal required	Trial removed the admitting juror, questioned others, found no prejudicial discussion; OCCA affirmed	Denied: record support for trial court credibility findings; removal cured any prejudice
(9) Cumulative ineffective assistance / cumulative error	Aggregate of alleged errors deprived fairness and warrants relief	Many claims are barred, unmeritorious, or speculative; OCCA considered cumulative effect	Denied: no reasonable probability outcome would differ when errors aggregated
(10) Request for discovery and evidentiary hearing	Tryon sought documents, scans, witness records and hearing to develop IAC claims	No good cause for discovery; record resolves issues; many requests concern barred claims	Denied: no basis for discovery or evidentiary hearing under Rule 6 and habeas standards

Key Cases Cited

Coleman v. Thompson, 501 U.S. 722 (1991) (states get first chance to correct federal rights violations; procedural default doctrine)
Strickland v. Washington, 466 U.S. 668 (1984) (two‑part test for ineffective assistance: deficiency and prejudice)
Atkins v. Virginia, 536 U.S. 304 (2002) (Eighth Amendment bars execution of intellectually disabled defendants)
Hall v. Florida, 572 U.S. 701 (2014) (IQ scores near cutoff require accounting for standard error of measurement)
Brumfield v. Cain, 576 U.S. 305 (2015) (state court unreasonably discounted IQ within SEM range)
Jackson v. Virginia, 443 U.S. 307 (1979) (Jackson standard: whether any rational trier of fact could find elements beyond a reasonable doubt)
Lockett v. Ohio, 438 U.S. 586 (1978) (sentencer must be allowed to consider any relevant mitigating evidence)
Chambers v. Mississippi, 410 U.S. 284 (1973) (exclusion of critical hearsay may violate due process in narrow circumstances)
Beck v. Alabama, 447 U.S. 625 (1980) (in capital cases, jury must be allowed to consider lesser included offenses when evidence permits)
McKinney v. Arizona, 140 S. Ct. 702 (2020) (state appellate court may reweigh aggravating and mitigating evidence) (noted by court in context)