Police were called to an address in Leven Street in Middlesbrough just after 22.50pm last night, Monday 23rd April 2012.
The body of a man was discovered and officers are treating the death as suspicious.
A forensic post mortem examination is due to take place to establish the cause of death. House to house enquiries are being carried out and forensic enquiries are taking place at the scene. The road is currently cordoned off.
Police would appeal for any witnesses that may have been in the area since 5pm on Sunday 22nd April and who may have seen anything out of the ordinary to get in touch.