2019 COA 21
Colo. Ct. App.2019Background
- Defendant Kerry Lee Cooper and victim L.K. were intimate partners; an altercation in 2013 left both with injuries and led to charges of menacing, third-degree assault, harassment, and cruelty to an animal.
- L.K.’s statements and trial testimony contained notable inconsistencies about the sequence and severity of events; Cooper denied most alleged violent acts but conceded pushing her on the forehead and pleaded self-defense as an alternative.
- At trial the prosecution elicited extensive "blind" (case‑general) expert testimony about domestic‑violence dynamics, the "power and control wheel," and why victims may stay, minimize, or recant.
- No independent evidence was presented showing a prior pattern of domestic abuse or an escalating cycle of violence between Cooper and L.K.; L.K. moved out immediately after the incident and never returned.
- The jury convicted Cooper of third‑degree assault and harassment but acquitted on menacing and animal cruelty; Cooper appealed claiming the expert testimony was inadmissible and prejudicial among other claims.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Admissibility of blind domestic‑violence expert testimony (relevance/fit) | Expert testimony was necessary to explain counterintuitive victim behavior and helpful to the jury given intimate‑relation context. | Expert opinions were irrelevant because there was no evidence of prior abuse, escalation, or patterns to which the expert’s generalizations could logically fit. | Reversed: expert testimony was largely irrelevant (did not "fit") and its admission was an abuse of discretion. |
| CRE 702 gatekeeper/reliability obligations | Trial court properly admitted the testimony; testimony aligns with recognized social science. | Trial court failed to make required findings on reliability/usefulness and admitted sweeping opinions without case‑specific factual predicates. | Majority: did not need to resolve reliability because testimony was irrelevant; trial courts must follow CRE 702/Ruibal on retrial. |
| Prejudice/harmless‑error (constitutional vs. nonconstitutional) | Any error was harmless in light of victim testimony, photographs, and officer corroboration. | Admission of blind expert testimony invited the jury to infer nonexistent prior bad acts and substantially influenced verdict; constitutional harmlessness standard should apply. | Majority: error was not harmless under the more stringent standard and reversal/remand for new trial required. (Partial dissent would find error harmless.) |
| Need for modified unanimity instruction on assault charge | Not necessary because charges arose from a single, short incident involving one victim. | Defendant argued a unanimity instruction was required to prevent juror disagreement about which act supported conviction. | Held: No modified unanimity instruction required. |
Key Cases Cited
- People v. Wittrein, 221 P.3d 1076 (Colo. 2009) (recognizing value of expert testimony in appropriate circumstances)
- People v. Shreck, 22 P.3d 68 (Colo. 2001) (CRE 702 gatekeeper framework: reliability and relevance inquiry)
- People v. Martinez, 74 P.3d 316 (Colo. 2003) (expert testimony must "fit" the factual issues to be helpful)
- Kaufman v. People, 202 P.3d 542 (Colo. 2009) (jury may try to fit facts to erroneously given instruction — risk of implying nonexistent evidence)
- Castillo v. People, 2018 CO 62 (Colo.) (discussing risks that jurors will force evidence to fit unsupported instructions)
- Barnhisel v. People, 347 P.2d 915 (Colo. 1959) (an instruction or suggestion not supported by the record may imply evidence not in record)
- Tevlin v. People, 715 P.2d 338 (Colo. 1986) (standard that erroneous admission requires reversal when it substantially influenced the verdict)
- Crider v. People, 186 P.3d 39 (Colo. 2008) (strength of properly admitted evidence is a key consideration in harmless‑error analysis)
- People v. Spoto, 795 P.2d 1314 (Colo. 1990) (procedures for admitting evidence of similar transactions/other acts)