Prosecutors fighting to protect their case against the 14-year-old accused killer of a Danvers High School math teacher told a judge yesterday there was nothing untoward about teacher Colleen Ritzer’s relationship with student Philip Chism.

“There is absolutely no evidence of any misconduct or wrongdoing by ?Ms. Ritzer of any sort,” ?Essex Assistant District Attorney David O’Sullivan said in a court hearing held for attorneys for several media outlets arguing to unseal Chism’s entire file in Salem District Court.

O’Sullivan offered no explanation for why he volunteered the statement as Daniel J. Murphy, the attorney for Ritzer’s family, looked on.

Judge Michael C. Laur­anzano’s 10-day impoundment order was due to expire last night; however, O’Sullivan had pushed for it to be extended until at least Nov. 22, when he expects a grand jury investigation of the facts of Ritzer’s stabbing death to be complete.

Lauranzano took the matter under advisement and did not indicate when he would render his decision.

O’Sullivan said he is willing to release a redacted version of his office’s affidavit for a search warrant, keeping sealed the identities of minor witnesses and yet-unreleased sensitive ?information.

But attorney Susan Oker, one of Chism’s public ?defenders, moved that the search warrant information remain sealed until after the teen’s trial.

“We don’t know that any of this information is ever going to be admissible in court,” Oker told Lauranzo before a courtroom packed with media and lawyers.

Oker said “statements taken from a 14-year-old child” that she described as “extraneous and inflammatory” will be “a very live ?issue” for the defense.

Ritzer’s Andover parents and siblings also are strongly opposed to the impoundment order being lifted.

With a strained voice, Murphy told Lauranzano, “They just buried Colleen. There’s simply no words to adequately describe what this family has gone through.”

“The family needs time to grieve and they ought to be afforded that opportunity,” Murphy said after the proceeding. “As time goes on, whatever happens, happens.”