(credit: Steve Jurvetson)

There’s yet another unhappy Theranos customer.

In a lawsuit filed Monday in the US District Court in Arizona, an ex-customer alleges that bum blood tests performed by the beleaguered biotech company directly led to him having a heart attack. (A PDF of the lawsuit is available here.) The test results were later voided by the company, independent of any involvement from the plaintiff, identified only as R.C. in the lawsuit.

R.C. joins at least nine other ex-customers suing the company over faulty tests and the company’s lofty but unfulfilled claims. Each lawsuit is seeking class-action status.