Defense attorneys for Ingmar Guandique, the man convicted and sentenced for the killing of government intern Chandra Levy in 2001, are asking that a judge allow them to hear the contents of a 911 call placed from Levy’s building the day she disappeared, reports WTOP.

The attorneys claim that the call was made by a resident of the building to report the sound of a “blood-curdling” scream; police in the past have said that the call wasn’t relevant to the investigation, but Guandique’s attorneys argue that its contents were never disclosed to them during the 2010 hearing that found him guilty of her murder.

Much of yesterday’s proceeding remained sealed and conducted at the bench, limiting how much information exists as to the case against Guandique and the possibility that his attorneys will request a new trial in the case. In February, his attorneys said that the case against Guandique was “predicated on a lie,” and that the jailhouse informant who testified that Guandique admitted to the crime could not be trusted.