The SIT submitted the around 1,500-page charge sheet in the judicial magistrate court at nearby Angamaly.
It had earlier filed a charge sheet against seven others including prime accused Pulsar Suni.
Dileep, who faces charges including conspiracy, has been named the eighth accused.
Four other persons have also been arraigned in the charge sheet, taking the number of accused in the case to 12.
Dileep's former wife and Malayalam actress Manju Warrier, whose statement was recorded by the police in connection with case, is a witness.
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The court had directed Dileep, arrested on July 10, to surrender his passport, deposit a bail bond of Rs 1 lakh and two solvent sureties for the like amount.
The police have charged Dileep with hatching the conspiracy with other accused to abduct and assault the actress in a moving car and film the act.
In their remand application after the arrest, police had claimed that Dileep developed a grudge against the actress for letting his former wife know about his alleged 'affairs' and had hatched a conspiracy to take revenge way back in 2013.
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