17-year-old Md Israfil and 15-year-old Robeya Khatun were married about eight months ago
In 2015, Nishan Ali, who used to work as a rickshaw van puller, was murdered at village in Mirpur Upazila.
On Monday, the court of District and Sessions Judge Towhidul Islam delivered the verdict with convicts Santu Sheilh and Mahibul Islam on the docks.
The court also slapped a Tk 10,000 fine on each, said Prosecutor Anup Kumar Nandi.