The close adviser to Mayor Vincent C. Gray who is implicated in an alleged scheme to hand a minor mayoral candidate a city job in exchange for political attacks has declined Gray’s nomination to a major city post.

Lorraine A. Green informed D.C. Council member Jack Evans (D-Ward 2) on Monday she would no longer pursue the chair of the Washington Convention and Sports Authority. The agency oversees the operations of the Walter E. Washington Convention Center, RFK Stadium and the D.C. Armory.

Mayoral candidate Sulaimon Brown (D) has said Green, who headed Gray’s campaign efforts, promised to give him a city job and cash payments in return for attacking Mayor Adrian M. Fenty (D), at candidate forums. Green has denied Brown’s allegations, and The Washington Post has not been able to verify the alleged cash payments.

Gray (D) nominated Green to head the board in January. Evans, who chairs the committee overseeing the board, had scheduled a hearing on her nomination for early March. After Brown’s allegations were publicized, Evans postponed the hearing indefinitely, effectively freezing the confirmation process.

“I’ve known Lorraine a long time,” Evans said Monday. “I think she would have been a great chair.”

Green’s attorney declined to comment on her behalf. A statement issued by Gray’s office said Green plans to pursue “a business venture she put on hold several years ago” and was thus unable to serve. She is set to testify before the D.C. Council on the Gray administration’s hiring practices Monday.