Thanks Ralph, This may be my Catherine. Her death cerificate in Baltimore lists her birth date as March 20, 1837. This record lists her baptism date as February 24, 1837. I also have another record that has her birth month as March. The Roscommon baptism record lists her mother as Celia Hanly. If I can locate another record with Celia as mother, then I'll be more confident this is a match.