17-year-old Md Israfil and 15-year-old Robeya Khatun were married about eight months ago
The Jessore Women and Children’s Repression Prevention Tribunal announced the verdict in the 2007 case on Tuesday.
The death row convict, Rafiqul Islam, is on the run.
Islam beat and then strangled his wife Nazma after her family failed to meet his demand for a Tk 100,000 dowry, said the court’s Public Prosecutor Idris Ali.
Nazma’s father filed the case over her murder.