An 18-year-old man has been arrested on suspicion of murder and remains in police custody.
This is in connection with the death of 25-year-old Jordan O'Brien. Four people have now been arrested in connection with this investigation.
Two have been bailed and one man has been charged.
Kieron Walker, 22, of Larch Avenue, Auckley, Doncaster, was charged with murder and possession of a knife/sharp pointed article in a public place and appeared in court on April 3. Following his appearances at both Lincoln Magistrates' Court and Lincoln Crown Court, he was remanded in custody.