“The C.C.R.B. will present evidence at trial on Sept. 19 and is confident it will meet its burden,” Jonathan Darche, the review board’s executive director, said in a statement.

The deal Officer Frascatore spurned would have allowed him to keep his job if he pleaded no contest and agreed to forfeit a few vacation days, according to his union lawyer, Stephen C. Worth.

Mr. Worth said in an interview after the hearing on Thursday that his client was rejecting the agreement because he had not received a signed form from the New York City Law Department indicating that Mr. Blake would surrender his right to sue Officer Frascatore.

“It fell apart because of this,” Mr. Worth said. “This is a sticking point. My client doesn’t feel he has all the protection he should have, and he’s not prepared to go forward without all the protection he can get.”

Mr. Blake’s lawyer, Kevin H. Marino, said the release had nothing to do with the officer’s trial.

“The suggestion that Mr. Frascatore has turned that down because of something Mr. Blake did or did not do just does not have any basis in fact,” Mr. Marino said.