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Ms. Whiting’s name surfaced last month when The Times reported on her hiring by the Gray administration in the wake of a bruising campaign in which she played a key role attacking Mr. Fenty and praising Mr. Gray. After the election, she received the political appointment to DPR.

Though neither Mr. Gray nor Ms. Whiting has elaborated on their relationship, Ms. Whiting testified in a police personnel matter last year that she has socialized with Mr. Gray. She referred to him as a friend.

The e-mail’s author, who described himself as a Gray supporter who valued his relationship with the mayor, said he tried to protect Mr. Gray by warning him of Ms. Whiting’s prior felony conviction. The e-mail from the supporter to a friend at the time said Mr. Gray claimed that Ms. Whiting no longer worked for his campaign.

Yet in August, a month after Mr. Gray learned of Ms. Whiting’s criminal record, Ms. Whiting penned an endorsement for him in The Washington Post. Campaign finance records show the Gray campaign made a $2,000 payment to Ms. Whiting on Nov. 16. She was listed as a “consultant,” the records show.

Ms. Whiting’s withering criticism of Mr. Fenty and her public statements in support of Mr. Gray continued for the duration of the campaign.

After the report of Ms. Whiting’s hiring in The Times, articles in The Post exposed the hiring and subsequent firing of another Gray supporter and Fenty basher. Former mayoral candidate Sulaimon Brown was fired from a special assistant job with the Department of Health Care Finance recently when issues about his past surfaced. He has publicly accused the Gray campaign of making cash payments and promising him a job in exchange for attacking Mr. Fenty during the campaign.

Controversies surrounding Mr. Gray’s campaign and his political hires have since prompted investigations by the campaign finance and inspector general’s offices to be guided by acting D.C. Attorney General Irv Nathan.

Gray spokeswoman Linda Wharton-Boyd told The Times in an e-mail last month that the Human Resources Department “conducts criminal background checks on all applicants.” Asked whether Ms. Whiting disclosed her federal felony conviction on her DC2000 form, Ms. Wharton-Boyd said in the e-mail, “a check by DHR of Ms. Whiting’s file indicates that her response to this question was yes.” But she declined to make the document public.

The assertion by the mayor’s top representative is at odds with Ms. Whiting’s account, and calls to a private firm where Ms. Whiting worked prior to joining Mr. Mendelson’s staff indicated she never disclosed her felony record when she applied for that job either.

“Nothing out of the ordinary was disclosed,” said Patrick R. Riccards, a spokesman for the American Institutes for Research, where Ms. Whiting worked as a payroll manager from 2005 to 2010.