(Reuters) - Groupon Inc's Lee Brown, who oversees the daily deal company's national sales, has decided to leave, following other senior executives who left the company this year, according to an internal memo obtained by Reuters on Thursday.

Brown, who was senior vice president of national sales and joined in 2010 from Yahoo Inc, will be replaced by Raj Ruparell.

(Reporting By Nivedita Bhattacharjee)

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