"We have arrested Sheikh Moktar from Howrah station area this evening. He was apprehended with one of his associates. He will be brought to the CID headquaters and interrogated," IG CID Vineet Goyal told PTI.
Kolkata Police Sub-Inspector Tapas Choudhury was killed during violence between Congress and Trinamool supporters near a college in Garden Reach on February 12.
The detective department of the Kolkata Police had begun an investigation and arrested 12 people along with Sheikh Subhaan who had allegedly fired at the SI.
Although the CID managed to arrest some of the accused named in the FIR, Congress leader Moktar and Trinamool Congress councilor Mohammed Iqbal had been absconding for days.
Iqbal is still at large.