District Judge Rakesh Siddhartha asked the agency to verify and inform the court about it on July 17.
The court was told by CBI prosecutor D P Singh that accused Peeriya died yesterday but the agency was yet to verify this fact.
The judge also said that prosecution witness Prem Kaur, who was present in the court, could not be examined today due to death of Peeriya.
To this, the prosecutor said on one occasion the witness could not be examined due to lawyers' strike and on another hearing, she had come on her own and was not summoned.
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The court was also informed that another accused Ved Prakash was hospitalised.
The court fixed July 17 for verification of death of the accused and recording of evidence in the case.
Sajjan Kumar, Brahmanand Gupta, Peeriya and Ved Prakash are facing trial on charges of murder and rioting in the case of killing of Surjit Singh in Sultanpuri area of West Delhi.
The trial court had also framed charges for the offence of spreading enmity between two communities against the accused in the case.