By Kate O'Keeffe 

HONG KONG--The world's largest casino operator is losing its leader in Macau amid the worst-ever downturn in the once-booming Chinese gambling hub, which has been hammered by Beijing's crackdown on corruption.

The Macau unit of Las Vegas Sands Corp. said in a statement Friday that its chief executive, Ed Tracy, has decided to retire effective March 6.

Mr. Tracy has no disagreement with the board and will be a consultant to the company after stepping down, according to the statement from the Hong Kong-listed unit Sands China Ltd.

The 62-year-old executive, who joined the casino operator in 2010 and was appointed chief executive in July 2011, said in a Friday letter to staff reviewed by The Wall Street Journal that he and his wife are returning to the U.S. to focus on family and health.

With the opening of The Parisian, Sands' fifth casino in Macau, still more than a year away, "the best management team in Macao already in place and several other important objectives already achieved, this seemed like the right point in time to announce my retirement," said Mr. Tracy in the letter. He didn't immediately reply to a request for comment.

Las Vegas Sands chairman Sheldon Adelson praised and thanked Mr. Tracy in a statement provided by the company's spokesman. As the company looks for a replacement, "we remain deeply committed to the future of Macao and the more than 28,000 team members there who are a part of the Sands family," said Mr. Adelson in the statement.

Shares of Sands China were down 3.0% at HK$36.95 in Hong Kong trading, but outperformed peers like SJM Holdings Ltd. and Galaxy Entertainment Ltd., which both finished more than 4% lower.

The announcement of Mr. Tracy's retirement comes amid a seven-month losing streak in Macau, which last year recorded its first annual decline in gambling revenue since data became available in 2002.

Executives and analysts attribute the sharp reversal of fortunes in Macau, which rakes in seven times more gambling revenue than the Las Vegas Strip, primarily to China's crackdown on corruption. In addition to bringing down many top mainland officials, the sweeping campaign has led high rollers to shy away from Macau's baccarat tables, they say.

It is unclear when the situation in Macau might improve as the campaign hasn't shown any signs of letting up. Local police Saturday arrested six people--including the nephew of the founder of one of the Chinese territory's casino operators--on suspicion of running a major prostitution ring, according to a police statement and a person familiar with the matter. The move against a member of such a powerful family was interpreted by some executives in Macau as a sign that no one is untouchable in the crackdown.

This week, analysts also cited concerns about a major junket operator closing down many of its operations. Junket operators, who recruit wealthy gamblers in China, lend them money to bet in Macau, and later handle debt collection, have been particularly hard-hit in recent months. Hong Kong has launched a money-laundering investigation into one of Macau's top junket figures and frozen his assets, The Wall Street Journal reported in December. Some junket and casino executives believe the case is connected to Beijing's closer scrutiny.

Mr. Tracy's resignation is the latest in a string of recent departures of Sands' top executives. Mike Leven retired at the end of the year after serving as president and chief operating officer of the Las Vegas company since 2009. The Macau unit's general counsel is set to retire in April, and its No. 2 executive left in September 2013 and hasn't been replaced.

Mr. Tracy joined Sands weeks after the company fired its previous Macau chief executive, Steve Jacobs, in July 2010. Sands says the former executive spawned U.S. bribery investigations into its operations with his subsequent wrongful termination lawsuit. The company has denied the claims in Mr. Jacobs' ongoing suit and said it is cooperating with federal investigators.

Anjie Zheng

contributed this article.

Write to Kate O'Keeffe at Kathryn.OKeeffe@wsj.com

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