His parents said they are suffering from a deep sense of insecurity after Fahad was killed on the university campus last week.
Fayaz is a first-year student at Dhaka College.
Their mother Rokeya Begum said the family was living in utmost insecurity.
“I’ve already lost one son and I don’t want to lose another,” she told UNB on Friday night.
Her husband Barkatullah said Fayaz is now afraid of going back to college.
Abrar Fahad, 21, a second-year student of electrical and electronic engineering, was beaten to death on Monday reportedly by Chhatra League leaders at Buet’s Sher-e-Bangla Hall.
Barkatullah filed a case at Chawkbazar Police Station on Monday evening accusing 19 people. So far, 18 accused have been arrested.
The Vice-Chancellor of Bangladesh University of Engineering and Technology (Buet) on Friday announced a ban on organisational student politics on the campus.
He said the 19 accused in Abrar killing case were suspended.