Officers went to the property in Coggins Mill Lane, Mayfield, on Thursday (February 25) following concerns that no one had seen the man for a few days.
The 52-year-old sole occupant was found dead at the house. His identity has not been released as police are still trying to locate his next of kin.
A 17-year-old boy from Crowborough was arrested on suspicion of murder on Saturday (February 27) and police have been granted a further 36-hours to question him. He is believed to be known to the victim.
A 17-year-old girl from Eastbourne has also been arrested on suspicion of assisting an offender and is also in custody.
A 16-year-old boy and an 18-year-old man both from Crowborough were also arrested on Sunday (February 28) on suspicion of assisting an offender and are in custody.
A post mortem revealed the man had died from multiple injuries.
Don’t miss out on all the latest breaking news where you live.
Here are four ways you can be sure you’ll be amongst the first to know what’s going on.
1) Make our website your homepage
2) Like our Facebook page
3) Follow us on Twitter
4) Register with us by clicking on ‘sign in’ (top right corner). You can then receive our daily newsletter AND add your point of view to stories that you read here.
And do share with your family and friends - so they don’t miss out!
Always the first with your local news.
Be part of it.