SYDNEY (Reuters) -Brookfield will walk away from Origin Energy, a source familiar with the matter said, after shareholders in Australia's largest power retailer rejected a $10.6 billion takeover bid by a consortium led by the asset manager on Monday. Final votes were 31.08% against the bid with 68.92% in favour, according to Origin's regulatory filings, lower than the 75% threshold required for a takeover to proceed. The deal was expected to fail after Origin's largest shareholder, A$300 billion ($198 billion) pension fund AustralianSuper, said it would reject the A$9.39 per share offer.