What are the relevant terms for this research problem? Remember, start with basic secondary sources and use a legal dictionary if needed.
Examples may include:
This fact pattern is well suited for a headnote segment search. Remember, that only cases have headnotes written by Westlaw/Lexis editors and only cases selected for publication are typically marked up. By doing a headnote search for "provocative act murder" you may effectively find much of the relevant case law on this topic.
For example, Westlaw:
Note that I'm using the "HE" segment (for the headnote field) and a phrase search for "provocative act murder".
In Lexis you spell out the segment. For example: