Officers were called to an address in London Road shortly after 1.20pm on Sunday 13 February to reports of a man in his 40s found injured.
Sadly, he was pronounced dead at the scene.
His death is being treated as suspicious and we have started a murder inquiry.
On Tuesday 15 February, we arrested a 44-year-old man from Southend on suspicion of murder.
He remains in custody at this time.
Police need anyone who saw anything or has any CCTV or dashcam footage to contact us.
If you have any information you can submit a report online at https://www.essex.police.uk or use the ‘Live Chat’ button to speak to an online operator between 7am-11pm.
Please quote incident 569 of 13 February.
You can also call us on 101 or contact Crimestoppers anonymously on 0800 555 111.