The workers were constructing a toilet at a school next to the temple in Faridpur’s Madhukhali Upazila
Moaz Abu Horaira was apprehended in Uttara's sector No. 14 around 11 am on Saturday, said DMP Deputy Commissioner Md Masudur Rahman.
Moaz is an electric and electronic engineering (EEE) student of the university's batch 17.
Law enforcers have so far arrested 19 people in connection with the murder, 15 of whom are named as suspects in the case.
Police arrested the four others on the basis of evidence tying them to the incident.