Emergency services received a report of a serious assault at an Armagh Street property about 7.35pm Sunday.
A body was located at the address and as a result a homicide investigation has begun.
Soon after police located a person who is assisting with the investigation.
Police believe this to be an isolated incident with no further risk to the public.
A cordon is in place at the intersection of Armagh Street and Barbadoes Street and includes part of Armagh Street east of that intersection.