Belinda Stronach poses in front of the Breast Cancer Research Centre being built at Sunnybrook Hospital in Toronto in March 2009. Stronach was diagnosed with breast cancer in 2007. ((Darren Calabrese/Canadian Press))

Belinda Stronach will leave the board of auto parts giant Magna International at the end of the month, the company announced late Tuesday.

Stronach, who is the daughter of company founder Frank Stronach, will also resign as the company's executive vice-chair. She assumed that role in April 2007 after announcing she would not seek re-election as a Liberal MP.

Stronach found herself in the midst of a political firestorm in 2005 when she crossed the floor to join the Liberals and become then prime minister Paul Martin's minister of human resources and skills development. In 2004, she had been elected as a Conservative in the Toronto-area riding of Newmarket-Aurora. 

No reason was given Tuesday for her departure from Magna.

"The board wishes to express our sincere and deep appreciation to Belinda for the valuable contribution she has made to Magna over many years and we wish Belinda every success in the future," said a release from the board's lead director, Michael D. Harris.

Stronach served as Magna's CEO before entering politics.