Date of Birth: 
Place of Birth: Cork, Munster, Ireland
About Marian Heffernan
- Marian Heffernan (born 16 April 1982 in Cork, Ireland) is an Irish athlete who competed in the women's 4 Ă— 400 metres relay at the 2012 Summer Olympics.
- Heffernan is fifth in the all-time Irish record books for the women’s 400 metres.
- She is married to Ireland’s renowned Olympic race walker Rob Heffernan.
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