There is a name floating around, from the Santa Monica Observer web site, that he is a former marine, convert to Islam, and that he has an online manifesto..I wont say his name since this might be fake news but will see
I saw that tweet, but cannot find it, now. If you have the tweet, you can post it. Just a way to info gather. Thanks.
I googled the name they provided, and this same name was used in a hoax alleging the identity of the Las Vegas shooter.
Fake news. Same hoax came out after Vegas.