Police have arrested Seyed Iman Tabarhosseini, 37, in north London this evening (Monday 12).
He's being held in police custody as investigations continue.
It's in connection with a body of a man in his 50s found inside a property in Magdalen Road, St Leonards, on Thursday (April 8).
Police released an appeal on Sunday (April 11).
Detective Chief Inspector Emma Vickers said:
“This continues to be a fast-moving investigation and we would like to thank the public for their assistance with this matter.
“We continue to appeal to anyone who thinks they might have information to assist our investigation, to come forward to us.
“You can report information to us either online or by calling 101 quoting Operation Leaf.”