The suspect was earlier arrested in connection with Nimalarajan killing, but escaped legal processing with the backing of SL Police, the residents alleged.
At least 600 civilians had come together on Sunday protesting against the SL military and the SL police.
The enraged villagers who had apprehended both the culprits handed them over to the SL Police demanding immediate investigations.
Fearing that the SL police and Navy would send away the alleged culprits, the protesters blocked the Ku’rikaadduvaan jetty, disrupting communication to and from the islet.
The leadership of the EPDP paramilitary was trying to describe that the culprit, caught by the villagers after the brutal rape and killing was no longer employed by the EPDP. An EPDP paramilitary operative named Uthayan was trying to divert the attention away from his group.
On Monday, schools remained closed and black flags were flown throughout the islet.