Brett Lee was shocked and bewildered when his wife suddenly walked out on their marriage, friends have revealed.The champion fast bowler is struggling to understand why Liz Kemp - mother of their 21-month-old son Preston - would have ended what he believed was a happy marriage.Lee's friends, however, have discounted the friendship between Ms Kemp, a former Double Bay podiatrist, and a high-profile rugby player as the cause of the split. The pair have been seen together at nightclubs and at lunc