Mrs. Henry Cox Dies UnexpectedlyMrs. Henry Cox, 81, died unexpectedly early Wednesday morning, May 29, 1983, at University hospitals in Iowa City. Death came following a brief illness.The former Queen Snow of David City, Nebr., Mrs. Cox was well known in the community, having taught piano here for more than 20 years. She began her career in music some 60 years ago.Married to Henry G. Cox in 1904, she and her husband who survives, were accomplished musicians and devoted their lives to music. She was instructing several piano students at the time of her death.Mr. and Mrs. Cox were residents of Omaha, Nebr., for 30 years before moving to Pella.Services will be held Saturday, 2:00 p.m., at the chapel of the Vati Dyk-Duven Funeral Home.