Jha was summoned for questioning on Sunday.
The Burari MLA arrived at the Civil Lines police station at around 4 pm and was questioned till 8 pm, the police said.
An officer said they have also summoned Rituraj and Gupta. While Rituraj has been called for questioning tomorrow, Gupta has been called day after tomorrow.
The role of both the MLAs in the case is under investigation as they were present at Chief Minister Arvind Kejriwal's residence, when the alleged assault took place on the night of February 19.
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Eleven MLAs, apart from Kejriwal, his former advisor V K Jain and Deputy Chief Minister Manish Sisodia, were present during the meeting when Prakash was allegedly attacked.
Jain, who was also questioned in the case, resigned yesterday, citing personal reasons.
On February 23, a police team examined the CCTV surveillance system installed at the chief minister's residence in Civil Lines area and seized the hard disc; the forensic report is still awaited.
Two other AAP MLAs - Amanatullah Khan and Prakash Jarwal - were arrested in the case.