A fourth man has been arrested in connection with the murder of James Mc Donagh from County Derry at the weekend.
The 28 year old from Castledawson died after he was assaulted outside a nightclub on the Hillhead Road in Toomebridge on Sunday morning.
Last night, a 41-year-old was arrested in Toomebridge on suspicion of murder.
A 20-year-old man arrested on Sunday night has been released on bail pending further enquiries.
Two other men, aged 24 and 52, who were arrested on Sunday night remain in custody.