A 50 year old man and 29 year old woman remain in Police custody on Wednesday morning.
The pair were arrested on suspicion of murder, following the discovery of the body of a 33 year old man in a property in Molesworth Road in Plymouth in the early hours of Tuesday morning.
Devon and Cornwall Police said a forensic post mortem is due to be carried out to identify the actual cause of death.
More top news
A Beach Hut sitting above St Ives Bay which was bought for £10 is now on sale for £80,000
There are fears the Cornish language could fade into obscurity, as the organisation that promotes it faces closure.
A Falklands war veteran whose face was rebuilt after suffering severe burns says he was deeply moved by an Exhibition in Exeter.