"Kevin Cooper (born Richard Goodman; January 8, 1958)[1] is an American man currently imprisoned at San Quentin State Prison's death row.[2] Cooper was found guilty of four murders in the Chino Hills area of California in 1983."
https://en.wikipedia.org/wiki/Kevin_Cooper_(prisoner)
https://www.championnewspapers.com/news/article_e60a9a48-98f9-11ed-bc22-839debc0178f.html#:~:text=Cooper%20was%20sentenced%20to%20death,who%20was%20spending%20the%20night.
https://www.dailybulletin.com/2023/01/13/clemency-probe-fails-to-exonerate-kevin-cooper-in-quadruple-chino-hills-murders/
http://lang.dailybulletin.com/projects/cooperwatch/case_overview/
https://wegotthiscovered.com/celebrities/whatever-happened-to-josh-ryen-the-sole-survivor-of-the-chino-hills-massacre/
https://www.cbsnews.com/pictures/kevin-cooper-chino-hills-massacre-evidence-photos/8/
Read coroner reports here:
https://kevincooper.org/chino-hills-murders/
Kill Queens Podcast also did a great job covering this case-
https://www.killerqueenspodcast.com/chino-hills-massacre/