## Facts

- High school students arranged an after-school fight outside a pizzeria after an online dispute.
- Bobby Chiu, a Hop Sing gang member, went to the location with fellow gang members as a crowd gathered.
- A melee occurred involving Chiu, his associates, and rival gang members.
- Chiu’s associate fired a gun during the confrontation, killing a bystander.
- The prosecution charged Chiu with first degree willful, deliberate, and premeditated murder, with gang and firearm enhancements.
- The jury received instructions permitting conviction on either (1) direct aiding and abetting of murder or (2) the natural and probable consequences doctrine based on a target offense (assault or disturbing the peace).
- The jury returned a general verdict convicting Chiu of first degree premeditated murder.

## Issues

1. Whether an aider and abettor may be convicted of first degree premeditated murder under the natural and probable consequences doctrine.
2. Whether giving the jury an invalid alternative theory of first degree premeditated murder liability requires reversal when the verdict does not reveal the theory relied upon.

## Decision

- The court held that an aider and abettor may not be convicted of first degree premeditated murder under the natural and probable consequences doctrine.
- The court affirmed the reversal of Chiu’s first degree murder conviction because the jury may have relied on the legally invalid doctrine.
- The instructional error was prejudicial under alternative-theory principles because the general verdict did not establish reliance on a valid theory.
- The court indicated the prosecution could retry Chiu for first degree murder on a valid theory or accept a reduction consistent with permissible liability (including second degree murder if supported).

## Legal Principles

- Accomplice liability has two distinct paths: (1) direct aiding and abetting, which requires the aider and abettor to act with the mental state for the charged offense; and (2) the natural and probable consequences doctrine, which imposes derivative liability for reasonably foreseeable additional crimes resulting from the aided target offense.
- The natural and probable consequences doctrine may support accomplice liability for second degree murder when that homicide is a reasonably foreseeable result of the target offense.
- First degree premeditated murder requires a heightened mental state (willfulness, deliberation, and premeditation) that cannot be imputed to an aider and abettor through foreseeability alone; liability for that offense must rest on direct aiding and abetting.
- When a jury is instructed on alternative theories and one theory is legally erroneous, a general verdict cannot stand unless the error is harmless beyond a reasonable doubt.

## Conclusion

The court limited derivative accomplice liability by barring first degree premeditated murder convictions under the natural and probable consequences doctrine, requiring proof of direct aiding and abetting with the requisite mental state, and reversed because the jury’s general verdict may have rested on the invalid theory.


People v. Chiu, 59 Cal. 4th 155, 325 P.3d 972 (Cal. 2014)