The incident happened at midnight on June 30.
The police arrested Jithin from his house at Manvilla at 9 am on Thursday.
Jayarajan also taunted that no one gave the accused chocolate when he evaded the police.
The police claim that the Youth Congress activist in custody has confessed to the crime.
MLA Shafi Parambil accused the police of trying to implement the agenda of the CPM to make a Congressman a suspect somehow.
Attipra Youth Congress President Jithin was taken into custody for questioning.
Congress has accused the LDF government of playing petty tricks as the probe into the attack had shed no light for nearly two months.
The decision was taken as the investigation team failed to identify the culprit, even after 23 days since the incident.
The help of C-DAC has been sought to get a better reading of the number plate of the two-wheeler used by the culprit.
The opposition staged a walkout in protest