Detectives have arrested a man from Tongi in Gazipur city night in connection with the ASP Mizanur Rahman murder case.
Masudur Rahman, deputy commissioner (Media) of Dhaka Metropolitan Police (DMP), said detectives arrested Shah Alam from Tongi on Saturday night.
The details of the arrest will be disclosed later at a press briefing at DMP media centre, Masud added.
ASP Mizanur Rahman of Dhaka Highway Police was found dead at Mirpur Beribandh (Embankment) in the city's Rupnagar area on June 21.
Mizanur, who joined the Bangladesh Police as a sub-inspector in 1988, set out from his Uttara residence after Fajr prayers for his workplace at Savar, police said.
Victim's younger brother Masum Parvez filed a case with Rupnagar Police Station against several unknown miscreants on the same day.