A fifth man is being extradited from Sweden in connection with the hit squad murder of a music executive at his £1.5 million ($1.96m) home in London last Christmas.
Flamur Beqiri, who was linked to a criminal caught in a Dubai raid, was shot several times on his doorstep in Battersea last Christmas Eve.
On Wednesday, four men appeared at London's Old Bailey in connection with the killing.
Kickboxer Anis Fouad Hemissi, 22, has already pleaded not guilty to murder.
His defence team are seeking medical reports over fears he may have suffered brain damage due to his profession as a kickboxer, which could affect his ability to provide instructions to his legal team.
On Wednesday, Mrs Justice Cheema-Grubb ordered that the reports on him should be completed prior to the next court hearing.
He appeared on video link from Belmarsh Prison.
Two further defendants, Tobias Fredrik Andersson and Esteven-alexis Pino-Munizaga, who were extradited from Sweden a few months ago, appeared at the hearing via video link from Wandsworth Prison.
Mr Pino-Munizaga's legal team indicated that he will be denying involvement in the murder in due course.
A fourth man, Clifford Rollox, is on bail and appeared in person at the court.
He is charged with perverting the course of justice.
Prosecutors said a fifth man was in the process of being extradited from Sweden.
All the defendants are due to appear in court on January 26 for a plea hearing.
A trial date has been set for next July.
The murder victim, Beqiri, 36, who was once a wanted crime lord in Sweden, died from gunshot wounds after the attack at his home.
Mr Hemissi was extradited from Denmark earlier this year.
Beqiri, an Albanian who grew up in Malmo in Sweden, had links to Spain's Costa del Sol drugs gangs and is understood to have fled to the UK five years ago after receiving death threats.
He was associated with a drugs gang called Los Suecos, "the Swedes", who operate on the Costa del Sol and were allegedly led by Amir Faten Mekky, who was arrested in a raid in Dubai this year.
Beqiri, who had run a record company in London called 2020rec, was with his wife and young son at the time of his killing.
He was once one of Sweden’s most wanted men in connection with a €2 million ($2.3m) international drugs trafficking case and knew several victims of recent gangland murders.
He had been associated with Mr Mekky, who had been on the run since evading capture in Spain in 2018.
Mr Mekky was arrested in Dubai in June in a joint international operation and is wanted for murders in the Spanish towns of San Pedro Alcantara and Estepona in 2018.