Two men, aged 43 and 53, arrested in connection with the death were last night released bailed.
A 35-year-old man and a 69-year-old woman, also arrested in connection with the death, remain in police custody.
A police spokesman said officers are focussing their investigation on establishing the relationship between all those arrested and the deceased, and are not looking for anyone else in connection with this incident at this time.
Anyone with information which could assist this investigation should call 101 and ask for the Hampshire Major Investigation Team in Southampton, quoting Operation Fabia.
Alternatively, information can be left anonymously by calling Crimestoppers on 0800 555 111.
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