A public feud between Kartel and former collaborator Mavado arose towards the end of 2006, stemming from Vybzâ€™ much publicized departure from the dancehall conglomerate group The Alliance. The feud resulted in numerous diss tracks released, in which each artist dissed the other and their associates over popular dancehall rhythms. In a police-overseen press conference in March 2007, both Mavado and Vybz Kartel publicly announced an end to hostilities and apologized to fans.
However, by the summer of 2008, tensions flared with a renewal of â€œdiss tracksâ€ from each artist, and a lyrical clash between the two at Sting 2008 left mixed views as to the â€œwinnerâ€.
Most of 2009 saw a continuation of the public feud, which dominated Jamaican media and, to a certain extent, Jamaican culture, with the two artistsâ€™ factions, Gaza(Kartel) and Gully (Mavado), being adopted by Jamaican youth, in some cases leading to street violence.
On 8 December 2009, Kartel and Mavado met with Jamaican Prime Minister Bruce Golding in an attempt to end the feud, which had by that time fueled mob attacks in some of the inner city neighborhoods of Kingston. The two had performed together on-stage the previous night in a sign of goodwill at the West Kingston Jamboree, a concert promoted by drug lord Christopher â€œDudusâ€ Coke. After the truce in December 2009, the two artists were scheduled to perform a unity concert in March 2010 in Barbados, which was later cancelled by Bajan Prime Minister David Thompson.
In 2008, Kartel launched his own liquor line; Street Vybz Rum. He hosted a weekly dance party Street Vybz Thursday, at the Building, a Kingston nightclub he managed with Street Vybz Rum business partner, Corey Todd. The rum is officially distributed by Vybz Distillers Limited. The same year, he also released his own condom line, Daggering Condoms. Street Vybz Rum production was stopped in 2011 because of a disagreement between him and Corey Todd. However, the collaboration resumed in 2012 as the two settled their differences, and despite Kartelâ€™s ongoing incarceration.
In 2011, he released his own shoe line, named Addiâ€™s, as well as his own line of â€œcake soapâ€.
When his singles â€œClarksâ€, â€œClarks 2 (Clarks Again)â€ and â€œClarks 3 (Wear Weh Yuh Have)â€ featured the British shoe brand Clarks in 2010, its sales numbers and prices in Jamaica increased considerably.
Vybz Kartel has also hosted his own reality television show â€œTeachaâ€™s Petâ€ on CVM Jamaica broadcast channel, the first reality television show hosted by a dancehall artist in Jamaica. The premise of â€œTeachaâ€™s Petâ€ found 20 women living in a Kingston house vying for the artistâ€™s affection; the showâ€™s lascivious content elicited condemnation of its sponsor, telecommunications company LIME. The show came to a halt with the artistâ€™s arrest on murder charges in September 2011.
He is also part owner of the website Media Vybz, which he announce in 2010.
On 29 September 2011, Kartel was arrested by police for marijuana possession. Jamaicaâ€™s Major Investigation Taskforce (MIT) later charged him with the murder of a Jamaican businessman, Barrington Burton, conspiracy to murder and illegal possession of a firearm.
While in prison in 2012, his book The Voice Of The Jamaican Ghetto: Incarcerated but not Silenced, co-written with business associate Michael Dawson, was published.
Though Kartel was granted bail for the Burton murder on 23 March 2012 for JD$3,000,000, he remained in jail in connection with a second murder, of one Clive â€˜Lizzardâ€™ Williams, of Waterford, St Catherine. He was charged, along with two others including Vanessa â€œGaza Slimâ€ Saddler, with perverting the course of justice, after Saddler allegedly claimed that Williams had robbed her in order to mislead the police into believing that he was still alive. Kartelâ€™s trial was originally scheduled for 21 January 2013, but had to be postponed due to a lack of jurors, and was rescheduled for 11 July.
On 24 July a jury found Kartel not guilty of the charge of murder of Barrington Burton. However, Kartel remained in custody pending the second murder case. His trial for the murder of Clive Williams started on 18 November 2013 on 13 March 2014 he was found guilty by an eleven-member jury (10-1) of murder of 27-year-old Clive â€˜Lizardâ€™ Williams. The 65-day trial was said to have been the longest in Jamaicaâ€™s history.