Omais Ahmad sheikh, son of Farooq Sheikh, resident of Chatapora Pulwama was reportedly killing in a brief exchange of gunfire with police and army in Bandipora distrct of north Kashmir last evening.
Omais, an official said, had joined militants in June earlier this year.
As the news of his killing spread, hundreds of youths in Pulwama town took to streets and held massive protests.
The protests continued for the whole night.
The authorities imposed curfew in Pulwama in wee hours today to keep the situation under control, said the official.
The body will be laid to rest after Friday prayers.
A heavy contingent of police and paramilitary personnel has been deployed across the town.
All major exit and entry points have been sealed to prevent the participation of Hurriyat leaders in the funeral prayers.