The Supreme Court had last month directed the Central agency to probe the sensational case.
The Thiruvananthapuram unit of the CBI yesterday submitted a re-registered FIR before the Chief Judicial Magistrate Court, Ernakulam, for further investigation as per the December 5 order of the apex court.
The CBI has not named anyone as accused in the FIR.
Jishnu Pranoy, a first year engineering student was found hanging in the hostel of Nehru College of Engineering and Research Centre, Pambady in Thrissur, in January last year.
The Pazhayannur police had registered a case on January 6, last year, on the basis of a statement given by Jishnu's classmate Amal I T.
In its FIR, the police had said Jishnu was caught by an invigilator for copying during the examination conducted at the college on January 6, 2017 and due to mental tension he attempted suicide by hanging himself in the bathroom of the men's hostel.
His friends rescued Jishnu and took him to the Taluk hospital in Ottappalam but he died on the way, it had said.
Jishnu's mother Mahija had moved the Supreme Court in October last year seeking a CBI probe into the matter.
The Supreme Court on December 5 directed the Central Bureau of Investigation to probe into the mysterious death of the engineering student.
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