Police confirm brother has been arrested and charged with murder.
Luke Connelly, 25, suffered serious injuries in an altercation which is said to have taken place in a house on Main Street, Newtowngrange.
He was rushed to hospital where he later died as a result of his injuries.
His brother Daniel Connelly has now been arrested and charged with the alleged murder of his own brother.
A spokesman for Police Scotland said: “Police can confirm a 27-year-old man has been arrested and charged in connection with the death of a man in the Newtongrange area of Midlothian.
“A 25-year-old man was found with serious injuries at an address in Main Street around 4am on Sunday, February 9, and was taken to Edinburgh Royal Infirmary where he passed away a short time later.
“The 27-year-old man was due to appear at Edinburgh Sheriff Court on Monday, February 10.”