Tools chosen: polymarket_direct polymarket_related kalshi_related claude_news gdelt_news wikipedia code_execution

Sub-questions (Fermi decomposition)

Planner reasoning

This is a legal-outcome question hinging on whether Utah's capital murder prosecution of Tyler Robinson yields a homicide conviction (trial verdict or guilty plea) before July 31, 2027. Key drivers are the trial schedule, plea-deal negotiations (a plea WITH admission of guilt counts as Yes; a no-contest/Alford-style plea without admission resolves No), and defense strategies (insanity, competency). The Polymarket price is the primary anchor; news search plus base rates on murder conviction rates fill in the rest.

# Current state Tyler Robinson faces aggravated murder and related charges in Utah state court for the killing of Charlie Kirk; as of late August 2026 he has NOT entered a plea, no trial date has been set, and the case is still at the bind-over stage (probable-cause ruling was heard/expected Sept 1, 2026). The death-penalty notice remains contested but intact. Resolution requires an actual judgment (conviction) by July 31, 2027 — a plea without guilt-admission, dismissal, or mistrial-without-retrial-verdict resolves "No." # Timeline of key events - 2025-09-10 — Charlie Kirk shot and killed at UVU; Robinson surrenders 2025-09-11 (confirmed, Wikipedia). - 2025-09-16 — Robinson charged with aggravated murder; death penalty announced (confirmed, Wikipedia). - 2026-05-18 (orig.) → delayed to 2026-07-06/10 — Preliminary hearing held at Fourth District Court, Provo; confession video shown; continuance granted for defense evidence review (confirmed, KSL, TMZ). - 2026-07-29 — Prosecutors push court to force case toward trial, call bind-over "straightforward" (confirmed, Fox News). - 2026-08-11 — Defense written bind-over argument due (reported, ABC News). - 2026-08-12 — No plea entered yet (reported, RedState). - 2026-08-19 — Prosecutors reveal bullet-engraving/political-motive evidence; push for trial on all charges (reported, Fox News/multiple). - 2026-08-25 — Defense seeks camera ban ahead of Sept 1 hearing (reported, Fox News). - 2026-09-01 — Scheduled bind-over probable-cause hearing (confirmed scheduled, Utah County Attorney). - No trial date set as of latest research (confirmed, Courthouse News, late Aug 2026). # Event Will Tyler Robinson be convicted of any criminal homicide offense in State of Utah v. Tyler James Robinson by July 31, 2027? # Outcomes to forecast Yes / No # Kalshi market anchor No direct Kalshi ticker found for this event (kalshi_related search returned no match for "Tyler Robinson" or "convicted"; only an unrelated Kirk Cousins NFL market surfaced). Polymarket is the best available cross-market anchor: current price 48.5% YES, down 8.5pp over 7 days, roughly flat (+0.5pp) over 30 days, range 33–57% over 69 days, $309.8K volume — indicating meaningful two-sided uncertainty and some recent softening on conviction-by-deadline. # Sub-question answers 1. **Polymarket price/trend** — 48.5% current, -8.5% (7d), +0.5% (30d); range 33-57% [polymarket_direct]. 2. **Procedural posture/trial timing** — Still pre-trial: bind-over ruling expected Sept 1, 2026; no plea entered; no trial date set as of late Aug 2026 [claude_news, Courthouse News]. Given capital-case complexity (death-penalty litigation, evidence volume), a verdict before July 2027 is uncertain but not implausible given ~11 more months of runway after bind-over. 3. **Plea negotiations** — No plea entered as of Aug 2026; no reporting of negotiations toward a plea deal [RedState]. Base-rate models assume ~70% of capital cases eventually resolve via plea, but no case-specific signal yet. 4. **Evidence strength / insanity defense** — Confession video shown at prelim hearing, bullet engraving/political-motive evidence revealed, witness/family testimony expected [TMZ, Fox News]. No competency/insanity defense reported; defense focus is on death-penalty aggravator/evidence-admissibility challenges (bullet trajectory argument) [claude_news]. 5. **Base rates** — US murder trial conviction rate ~90-95%; ~70% of capital cases resolve by plea historically [code_execution model]. Acquittal/mistrial rates in capital murder cases are low but non-trivial given complexity. 6. **Death penalty notice / continuances** — Death penalty notice contested but upheld; contempt finding against a prosecutor addressed via jury-selection procedures, not case delay; preliminary hearing already delayed once (May→July 2026) for defense evidence review [Courthouse News, KSL]. No trial date set; further continuances plausible given capital-case complexity. 7. **Other markets** — No matching Kalshi market found; Polymarket variant scan returned zero related markets beyond the primary one. # Key facts (high-confidence, factual) 1. [Wikipedia] Kirk shot 2025-09-10; Robinson surrendered 2025-09-11; charged 2025-09-16 with aggravated murder, death penalty sought. 2. [claude_news/KSL] Preliminary hearing held July 6-10, 2026 after delay; confession video presented. 3. [claude_news/Courthouse News] No trial date set as of late Aug 2026; bind-over ruling pending Sept 1, 2026. 4. [claude_news] Death penalty notice remains intact despite defense motions to strike. 5. [claude_news] No plea entered as of mid-Aug 2026; no competency/insanity defense reported. # Cross-market signals - Kalshi related: no matching or comparable market found. - Polymarket: 48.5% YES, volatile (33-57% range), recent downward drift suggests growing perceived risk of non-resolution by deadline (delay risk) rather than acquittal belief. - Sportsbook implied: none available. # Analyst opinions and speculation - [code_execution model] Conditional on the case reaching a verdict/plea by deadline, conviction is near-certain (~87-90%), but overall probability is dominated by "R" — whether resolution (verdict or completed guilty plea) occurs before July 31, 2027. Base-case model estimate: ~48% (range 27-71% across plausible parameter grid), median ~48%. - Capital cases historically take 2-4+ years to reach trial; case charged Sept 2025 gives ~22 months to the July 2027 deadline — tight but not impossible if bind-over/pretrial motions resolve efficiently in fall 2026. # Directional lean per outcome - **Yes**: Strong publicly reported evidence (confession, forensic/motive evidence) implies high conviction probability if case reaches judgment; prosecutors pushing aggressively for trial. - **No**: No trial date set, no plea entered, death-penalty litigation and pretrial motions could extend timeline past July 2027; even a mistrial without retrial verdict resolves No; Alford/no-contest plea also resolves No. # Gaps / unknowns - No confirmed trial date; unclear if case can conclude (verdict or full guilty plea) before July 31, 2027. - No Kalshi-specific price found for direct comparison/arbitrage. - Unknown whether Sept 1, 2026 bind-over hearing outcome accelerates or further delays proceedings. # Calibration anchors - Polymarket YES price: 48.5% (primary cross-market anchor, no Kalshi ticker found). - Model-based base case: ~48% (range 27-71%) reflecting dominant "timing/resolution-by-deadline" uncertainty over conviction-given-resolution certainty (~90%).

1. **Critical unresolved discrepancy on the resolution deadline**: The brief's stated CLOSE TIME is 2026-12-31, but the actual question requires conviction "by July 31, 2027." Forecast 1 flags this ambiguity but doesn't act on it or adjust probability accordingly; Forecast 2 doesn't even mention it, despite it being a first-order issue that could nearly halve the available runway and thus significantly cut P(Yes). 2. **Over-reliance on Polymarket as a like-for-like anchor**: Both forecasters anchor tightly to the 48.5% Polymarket price without verifying its exact resolution date matches the July 2027 deadline used in this question — if Polymarket's contract closes earlier (e.g., year-end 2026), it is not a valid direct anchor and both are importing a mismatched reference class. 3. **Plea-deal dynamics underexplored**: The brief notes ~70% of capital cases resolve via plea historically, and that a guilty plea (not just trial verdict) would count as a conviction, but neither forecaster models the probability or timing of a plea specifically — especially the well-known pattern where capital defendants plead guilty close to trial to avoid execution risk, which could meaningfully raise P(Yes) within the window even without a completed trial. 4. **Political salience as an accelerant not credited**: Given the extraordinary political profile of the Kirk assassination, prosecutors/courts may be under unusual pressure to expedite proceedings relative to typical capital-case base rates (2-4 years), a case-specific factor that could shift timing meaningfully faster than the generic base rate both forecasts lean on. 5. **Insufficient weight on tail/delay scenarios**: Neither forecast substantively engages with concrete anecdotes of delay already occurring (preliminary hearing postponed once, contempt finding against a prosecutor, ongoing death-penalty-notice litigation, camera-ban disputes) as compounding evidence that further continuances are likely, which could justify a lower P(Yes) than the ~42-48% both settled on. 6. **Convergence without justified narrowing**: The model's own base case shows a wide 27-71% range reflecting genuine uncertainty, yet both forecasts cluster within a narrow 42-48% band near the midpoint — this convergence isn't well justified given the brief's explicit acknowledgment of high volatility (33-57% Polymarket range) and unresolved procedural unknowns.

44% (52% confidence)

Yes: 44% No: 56%

Conditional on a judgment being entered, conviction is near-certain (confession video, engraved-bullet/motive evidence, no competency or insanity defense reported), so the binding uncertainty is whether a verdict or completed guilty plea occurs by July 31, 2027. As of late August 2026 the case is still at bind-over with no plea and no trial date, and Utah capital litigation (death-penalty notice fights, evidence-admissibility motions, jury-selection procedures after the contempt issue, one prior continuance) routinely stretches beyond 22 months from charging. Offsetting factors — extraordinary political salience creating pressure to expedite, prosecutors publicly pushing for a straightforward bind-over, and the meaningful chance of a late guilty plea to avoid execution risk (which would resolve Yes) — keep this close to a coin flip rather than clearly negative. Polymarket's 48.5% is the only cross-market anchor and its recent 8.5pp softening reflects delay risk, not acquittal belief; I shade a few points below it for compounding continuance evidence and resolution-date ambiguity.

Total pipeline time: 248.7s