In Chapter 7 documents filed in U.S. Bankruptcy Court in the Southern District of Florida last week, Walker reported having $4.3 million in assets and $12.7 million in liabilities.
Walker's 2006 NBA championship ring, valued at $6,000, is included in a list of assets.
It's not the first time Walker has faced financial trouble. In November 2009, he agreed to pay more than $900,000 to settle bad check charges at three Las Vegas casinos and avoid trial on felony criminal charges.
Walker was a three-time all-star with the Boston Celtics. He won the 2006 championship with the Miami Heat.
Walker's attorney did not immediately return a message seeking comment.