The court of Dhaka Speedy Trial Judge Abdur Rahman Sardar announced the verdict on Thursday, six years after the murder.
The convict, Manik Sarkar, has also been ordered to pay a fine of Tk 10,000.
The 32-year old broke down in tears as the verdict was read out .
According to the case file, Manik had worked as a cleaner at the Arirang restaurant in Dhaka.
Angered over problems with his wages, Manik attacked the 69-year old woman with a knife on Nov 9, 2011, stabbing her in the neck and shoulder areas. He fled when a witness to the attack raised an alarm.
The victim was initially taken to Dhaka’s Apollo Hospital and then transferred to a hospital in South Korea, where she died on Nov 17 of that year.
Her husband filed a case over the incident at the Gulshan police station on Nov 9. Police submitted the chargesheet on Apr 30, 2012.
Manik was arrested and submitted a deposition to the magistrate under section 164 of the Constitution. The court rendered its verdict on Thursday after hearing to the testimony of 15 persons.