Police were called to an address on Hutton Avenue in Hartlepool, at around 10.20pm last night, Tuesday 31st December 2013.
A thirty one year old local man was taken to hospital with serious injuries but sadly pronounced dead.
A post mortem examination will be carried out to establish the cause of death later today.
Police have cordoned the address off and are carrying out house to house enquiries in the area.
A 17 year old has been arrested in connection with the incident and is due to be questioned by police.
Police would ask that anyone who was in the area at the time last night and who may have information to contact the non-emergency number 101.