Not much is known about the Schwartz couple, other than that they were in their 80's, they were first class passengers, and both committed suicide through means of overdosing on cyanide.
It is also rumored that Mrs. Schwartz is known as Coffee Filter Lady. This rumor is hard to confirm as she is seen after they are pronounced dead. It is also rumored she was a former KGB Member, If so then she should not be messed with.