Two more people have been arrested following the death of man who was stabbed in the leg.
A 17-year-old boy and a 28-year-old woman were taken into custody on Monday in connection with the death of Courtney Valentine-Brown in Southend. Both have since been released.
Mr Valentine-Brown, 36, was attacked in Roots Hall Drive just before midnight on 21 February.
Ian Slater, 49, of Wayletts, Leigh-on-Sea, has been charged with murder.
The 17-year-old boy, from London, was arrested on suspicion of intent to supply Class A drugs and later released under investigation.
The woman, from Westcliff, was arrested on suspicion of permitting premises to be used for drug supply and obstructing a police officer. She has been bailed until March 20.
A 30-year-old woman arrested on suspicion of conspiracy to commit murder has been released on bail until March 21.
A 35-year-old man from Southend arrested on suspicion of murder remains in police custody.