SB 1173 California Senate · 2025-2026 Regular Session

Jury instructions: lesser related offenses.

Summary
Existing law authorizes the finder of fact in a criminal prosecution to find the defendant guilty of an offense that is necessarily included in the charged offense. Case law requires the trial court to instruct the jury that it must find the defendant guilty of a necessarily included offense if there is substantial evidence that the defendant is guilty of the necessarily included offense. This bill would require the court, if requested by a defendant, to instruct the jury on a lesser offense, which is closely related to the offense charged, if the court finds that the defendant has relied on a theory of defense consistent with a conviction for the lesser offense, the evidence of the lesser offense is relevant to and admitted for the purpose of establishing guilt of the charged offense, and a basis exists on which the jury could find the offense to be less than charged. The bill would also authorize the judge to find the defendant guilty of the lesser offense if there is no jury. The bill would require the defendant to provide notice to the prosecution of the intent to seek the above-described jury instruction, as specified.
Bill status passed both 4 of 5 stages cleared
Introduction
Feb 2026
Committee Review
Jun 2026
Senate Passage
May 2026
Assembly Passage
Aug 2026
Governor
Introduced Feb 18, 2026 Last action Aug 27, 2026
Maddy AI version diff · 5 comparisons

What changed between versions

08/30/26 - Enrolled SB1173 · 1 edit
MINOR
No substantive policy changes were made between these two versions. The difference is purely presentational: the first version is the formal enrolled bill document with traditional legislative formatting, while the second is a web page rendering of the same bill from the California legislature website, complete with navigation menus and metadata. The actual statutory text of Section 1159, including all three conditions for lesser related offense instructions and the notice requirements, is identical in both versions.
TECHNICAL

The bill text was reformatted from a formal enrolled document layout to a web page presentation, adding website navigation elements (search, FAQ, sitemap, login), bill history metadata, and share/track options. No changes to the underlying legal content.

Floor votes · Senate May 27, 2026 · Assembly Aug 26, 2026

How they voted

2510
Passed · 5 other
Total votes 40
May 27, 2026
D Democratic30
25 Yea 1 Nay 4
83% Yea
R Republican10
9 Nay 1
90% Nay
Vote distribution
All Yea All Nay Mixed No data
Full legislative history

Actions timeline

Total actions
25
Key actions
9
Committee
6
Amendments
6
Aug 27, 2026
Upper · Passed
Assembly amendments concurred in. (Ayes 27. Noes 10.) Ordered to engrossing and enrolling.
upper
Aug 26, 2026
Introduced
In Senate. Concurrence in Assembly amendments pending.
upper
Aug 26, 2026
Lower · Passed
Read third time. Passed. Ordered to the Senate.
lower
Aug 20, 2026
Lower · Passed
Read third time and amended.
lower
Aug 13, 2026
Lower · Passed
Read second time and amended. Ordered to second reading.
lower
Aug 13, 2026
Lower · Passed
From committee: Do pass as amended. (Ayes 11. Noes 4.) (August 13).
lower
Jun 25, 2026
Committee
Re-referred to Com. on APPR. pursuant to Assembly Rule 97.
lower
Jun 24, 2026
Lower · Passed
From committee: Do pass. (Ayes 6. Noes 2.) (June 23).
lower
Jun 4, 2026
Committee
Referred to Com. on PUB. S.
lower
May 27, 2026
Upper · Passed
Read third time. Passed. (Ayes 25. Noes 10. Page 4480.) Ordered to the Assembly.
upper
Apr 14, 2026
Upper · Passed
From committee: Do pass. (Ayes 5. Noes 1. Page 3872.) (April 14).
upper
Apr 8, 2026
Committee
Re-referred to Com. on PUB. S.
upper
Mar 23, 2026
Upper · Passed
From committee with author's amendments. Read second time and amended. Re-referred to Com. on RLS.
upper
Feb 26, 2026
Committee
Referred to Com. on RLS.
upper
Feb 18, 2026
Introduced
Introduced. Read first time. To Com. on RLS. for assignment. To print.
upper
1 primary · 3 co-sponsors

Sponsors