This is not first and not last time if he steal coins in decentralized system. Maybe time start think how community can offer better way to trust new business, centralized trust page for business starter who want verify their identity..?
He sold over 60% of the shares... over $6,000USD at the time. He needs to respond as soon as possible. This is a serious crime and with or without the identification, it won't be that hard to find out detailed information about him.
I for one, will be giving him until the end of the month (more than enough time) to clear matters up before I put in a hard effort to get to the bottom of this.