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ORLANDO (AP) — A judge overseeing a misdemeanor stalking charge involving former neighborhood watch volunteer George Zimmerman has warned attorneys not to attempt to retry a previous murder case that ended with his acquittal.

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The judge on Wednesday told attorneys at Zimmerman’s pretrial hearing not to “open old wounds.”

Zimmerman is accused of sending threatening messages to a private investigator who had contacted him about a documentary series on Trayvon Martin. Martin is the black teen Zimmerman fatally shot in 2012. Zimmerman was acquitted of criminal charges. The documentary is being produced by rapper Jay Z.

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A sheriff’s report says private investigator Dennis Warren received numerous calls and texts from Zimmerman in December.

The judge granted a request from Zimmerman’s attorney to allow the investigator to be deposed.

Zimmerman didn’t attend Wednesday’s hearing.

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(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)