Mr Hollran travelled to Carrickfergus from Belfast by train
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Police investigating the murder of Thomas Hollran in Carrickfergus at the weekend have arrested three men.
They also carried out a number of searches in the County Antrim town. Mr Hollran, 49, was found with serious injuries in an alleyway on Saturday.
Mr Hollran was found at about 2200 GMT and was taken to hospital where he died on Sunday afternoon.
It is understood he was ordered to leave Carrickfergus last year following a dispute with loyalist paramilitaries.
Police think Mr Hollran travelled to Carrickfergus from Belfast by train on Saturday, arriving at the Clipperstown train station at about 2125 GMT.
They believe that he walked to the Woodburn area to visit a relative.