help me with this socal starfish

I found lots of these guys today while diving at the old marine land in Palos Verdes.

there were tons of these but my book Guide to Marine Invertebrates by Daniel Gotshall doesn't cover it.

He was eating something, I couldn't tell what it was. He was about 12"~16'' across.

My only guess is that it is a Giant Spined Star but he isn't really the correct colors.

Thanks!

http://www.flypierce.com/scuba_marineland/...sh.unknown.html

Purple Ochre Sea Star (Pisaster ochraceus)

Thanks for that! my book only has the ochre star which is orange... i knew it was something simple. Thanks!