When Mary Catherine Calvert was born on 23 March 1848, in Knox, Indiana, United States, her father, James Calvert, was 27 and her mother, Sara Emaline Hedden, was 18. She married Michael Agan on 4 August 1876, in Knox, Indiana, United States. They were the parents of at least 1 daughter. She lived in Busseron, Knox, Indiana, United States in 1880. She died on 20 October 1883, in Knox, Indiana, United States, at the age of 35.