Our project explores un- and under-reported incidents of police officer involved (POI) homicides, both justified and unjustified. To fill gaps found in existing government and local databases pertaining to POI homicides, we deploy participatory action research methods through community involvement in mining and analyzing social media data related to these incidents. Through these methods, social media information operates in concert with publicly available government and local databases to create a clearer representation of the lived realities of communities experiencing police homicides in the United States. Los Angeles County is our first community of study.