The Medawachchiya Police arrested a woman and a man for allegedly hacking to death a man who was receiving treatment at the Anuradhapura Hospital.
The couple is said to have assaulted the young man earlier over a dispute.
Police said the 27-year-old man and the 23-year-old woman were married and are residents of Medawachchiya.
A fight had broken out recently between two groups of powerful heroin traffickers in Medawachchiya over a love affair. During the fight, a 24-year-old youth had sustained injuries and was admitted to Anuradhapura Hospital.
He was later found to have been hacked to death at around 4.30 a.m. on April 28. Police are to arrest three more suspects in connection with the murder. The arrested couple is to be produced in Courts.