Hamilton v. State, 309 Ga. 1

Background

Victim: Tamia, a three-year-old adopted daughter, found unresponsive Jan. 30, 2015; kept on life support and died Feb. 5, 2015; autopsy ruled death a homicide from traumatic closed‑head injury.
Hamilton was the only adult in the home in the period before discovery; he delayed calling 911 and first spoke with his wife; EMTs found unresponsive child with unreactive pupils, clenched jaw, tongue biting and later posturing.
Imaging and autopsy showed a large subdural hematoma from a torn bridging vein, brain shift, infarction, uncal herniation, and retinal hemorrhages—findings the State’s experts described as catastrophic, consistent with major inertial/impact force and inconsistent with a week‑old stair fall or a delayed lucid interval.
State expert Dr. Mary Case performed BAPP (beta amyloid precursor protein) staining and reported axonal injury patterns supporting traumatic inertial injury; other State experts (Melnikoff, Bryant, Terry) similarly discounted rebleeding as an adequate explanation.
Defense expert Dr. Arden acknowledged acute traumatic injury but opined there was also older hemorrhage/membrane and that rebleeding or the prior stair fall could possibly explain the findings (albeit less likely).
Procedural posture: Hamilton was tried Jan–Feb 2018, convicted of felony murder (merged aggravated battery), sentenced to life without parole, appealed arguing (1) insufficiency of the evidence (circumstantial — alternative hypothesis of an earlier fall/rebleed) and (2) improper admission of Dr. Case’s BAPP testimony. The Georgia Supreme Court affirmed.

Issues

Issue	Hamilton's Argument	State's Argument	Held
Sufficiency of evidence given circumstantial proof and reasonable‑hypothesis rule	State failed to exclude reasonable hypothesis that injuries resulted from the earlier stair fall or rebleeding	Evidence showed instantaneous catastrophic injury, no other adults present, experts discounted rebleeding; jury could reject defense hypothesis	Affirmed: evidence sufficient; reasonable alternative excluded by other evidence and expert testimony
Admissibility of Dr. Case’s BAPP stain testimony (scientific reliability/foundation)	BAPP testing not shown reliable or validated; technique questioned in literature	Under Harper standard, Dr. Case showed qualifications, explained methods and reliability, and performed acceptable procedures	Affirmed: trial court did not abuse discretion in admitting BAPP testimony; foundation satisfied; testimony cumulative even if error
Challenge to Harper (Daubert vs Harper) and preservation	Argued Harper standard unconstitutional / sought Daubert analysis	Trial court applied Harper; Hamilton did not preserve a surviving constitutional challenge as error on appeal	Court declined to find Harper unconstitutional and did not reverse on that basis

Key Cases Cited

Jackson v. Virginia, 443 U.S. 307 (constitutional sufficiency standard for convictions)
Cochran v. State, 305 Ga. 827 (standard on circumstantial evidence and reasonable‑hypothesis rule)
Bamberg v. State, 308 Ga. 340 (jury’s role resolving conflicts and alternative hypotheses)
Johnson v. State, 269 Ga. 840 (reversal where State failed to exclude reasonable hypothesis of innocence)
Harper v. State, 249 Ga. 519 (trial‑court gatekeeping standard for scientific evidence in criminal cases)
Walsh v. State, 303 Ga. 276 (two‑part foundation for scientific evidence: general validity and proper performance)
Winters v. State, 305 Ga. 226 (abuse‑of‑discretion review of expert admissibility and confirmation Harper remains controlling)
Taylor v. State, 306 Ga. 277 (harmless‑error standard for nonconstitutional errors)
Sharp v. State, 286 Ga. 799 (no abuse of discretion where opponent presented no expert to undermine contested scientific testimony)
Bulloch v. State, 293 Ga. 179 (admission of cumulative expert testimony harmless when other evidence independently supports verdict)