She was born in Withington, Manchester. She plays for Reading Hockey Club, and has represented her country many times. In the London 2012 Olympic Games she was hit by a stick in the team's opening match against Japan and suffered a broken jaw, but after missing two matches she returned to play in Great Britain's penultimate group game against China.
In 2013 she had a civil partnership with fellow hockey player Helen Richardson and both changed their last name to Richardson-Walsh. The couple were listed at number 82 in the Pink List 2013. The citation said:
- "Just over a year after they helped Great Britain win its first Olympic women’s hockey medal in 20 years, team captain Kate Walsh and midfielder Helen Richardson got married in September. Maidenhead-based Richardson is studying psychology and Walsh was voted onto the European Athletes’ Commission earlier this month."
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- http://www.getreading.co.uk/news/local-news/readings-olympic-hockey-stars-helen-5836145 David Wright, "Reading's Olympic hockey stars Helen Richardson and Kate Walsh to marry" Get Reading 4 September 2013