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Apprentice hopeful Paul Sullivan’s cousin is a renowned grime artist serving life for murder .

London rapper Crazy Titch, real name Carl Dobson, was jailed in 2006 for shooting music producer Richard Holmes in a row over a song’s lyrics.

I can reveal Dobson’s violent past as his relative, marketing exec Paul, 38, tries to land a £250,000 investment from Lord Sugar.

Dobson was 23 when he took revenge after half-brother Dwayne Mahorn, 31, also a rapper known as Durrty Goodz, was “disrespected” in a song by up-and-coming rap star Shaba Shah in 2005.

(Image: BBC)

He was furious after hearing Shaba’s line: “Over the years, things change in the hood. I used to have a lot of respect for Durrty Goodz – Not no more.”

Dobson confronted track producer Richard – a pal of Shaba – in Chingford Hall Estate, East London.

As others fled, Richard, 21, stood up to the rapper and accomplice Anthony Green, but a handgun was held to his head before he was shot in the back and blasted in the leg with a MAC-10 machine gun.

Dobson – who sparred with rapper Dizzee Rascal during an MC battle recorded for pirate radio in 2003 – got a minimum 30 years at the Old Bailey along with Green.

Dobson is related to entrepreneur Paul through his mother, who is from St. Lucia.

A source close to the Apprentice candidate said: “He and Carl knew each other growing up but didn’t see much of each other after Carl was about ten.

“He knew what happened and felt Carl had had a tough life.”

On Thursday, for the first time, both Apprentice teams failed their task.