State v. Nichols, 284 P.3d 1246

Defendant was convicted of murder, first-degree theft, and unlawful possession of a controlled substance; appeal focuses on expert testimony exclusion.
Pierce, an elderly neighbor, was murdered in her home; last seen alive Nov. 15, 2007; death ruled homicide by asphyxiation with blunt trauma.
Relation between Pierce and defendant had recently deteriorated; Pierce had accused defendant of stealing her Oxycodone the prior month.
Police investigation followed discoveries of theft and subsequent homicide; defendant was questioned, with witnesses noting unusual behavior during early interviews.
State presented incriminating statements from defendant and an inmate network, and evidence defendant possessed Pierce’s property after death.
Defendant sought to admit expert testimony from her counselor about mental health issues; trial court excluded it for lack of helpful connection to behavior.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether exclusion of expert testimony was erroneous	Ortega argues the testimony could explain behavior during investigation.	State objects; testimony lacks relevance and assistive value under OEC 401/702.	Court held exclusion proper; testimony would not assist the jury.

State v. Gherasim, 329 Or 188 (1999) (dissociative amnesia testimony required connection to behavior)
State v. Middleton, 294 Or 427 (1983) (expert testimony explaining behavior admissible to illuminate credibility)
State v. Brown, 297 Or 404 (1984) (testimony must assist the trier of fact under OEC 702)
State v. Stringer, 292 Or 388 (1982) (testimony must be helpful to jury; relevance and foundation required)