Lindsay Lohan Lindsay Lohan

Lindsay Lohan is once again under police investigation — this time for the possible theft of a $2,500 necklace.

Detectives obtained a search warrant Tuesday for Lohan's Venice, Calif., home to look for the necklace, but the jewelry was returned before the warrant was executed, the Los Angeles Police Department said in a news release Wednesday. Police did not specify who returned the necklace.

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Lohan is now under investigation for possible grand theft, Officer Bruce Borihanh told TVGuide.com.The necklace, described by police as "one of a kind," was stolen from a Venice store on Jan. 22, nearly three weeks after Lohan was released from court-ordered rehab, stemming from her 2007 DUI case.Lohan, 24, remains on probation and is due in court Feb. 25 for a progress hearing.

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The stolen necklace case is the second active one against the actress, who is also under investigation by Riverside County prosecutors for alleged battery on a Betty Ford Center staffer during a December altercation.Los Angeles Superior Court Judge Elden S. Fox told Lohan in October that she will face a mandatory 180-day jail sentence if she violates probation, which requires her to obey all laws and submit to random drug tests.An email to Lohan's lawyer was not immediately returned.