The Vybz Kartel murder trial has resumed in the presence of the a 12-member jury.
The jury and members of the public, including the media, have been out of the courtroom since last Thursday as cybercrimes expert Detective Sergeant Patrick Linton gave evidence.
Group chief technology officer at Digicel, Mario Hassad is now on the stand.
He told the court about cell site towers and how they operate in providing signals to and from mobile phones.
The police had reported that they have video and audio recordings linking Vybz Kartel and his co-defendants to the killing.
Kartel is jointly charged with fellow entertainer Shawn Campbell also known as Shawn Storm, Kahira Jones, Shane Williams and Andre St John for the August 16, 2011 murder of Clive 'Lizard' Williams.
Williams was allegedly killed in relation to two missing guns.
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