Published : 13 May 2013, 01:18 PM
Speaker Shirin Sharmin Chaudhury administered the oath at 3pm.
The parliamentary seat fell vacant after the death of veteran Awami League politician Abdul Jalil at a Singapore hospital on Mar 6.
The Awami League Parliamentary Board nominated Malek to contest the by-election and he was elected unopposed as the opposition alliance stayed away from the balloting.