Peter Kenny pleaded not guilty to killing John Carroll in Grumpy Jack’s pub in 2009
Christopher Zambra tussled with attacker in Drimnagh before being shot several times
38-year-old was ambushed in Drimnagh last May when two vehicles blocked his car
Suspected drug dealer Christopher Zambra shot dead in Drimnagh on Sunday
Christopher Zambra had been blamed for murder of Real IRA man Alan Ryan
Evidence in trial of Christopher Zambra not accepted and now under investigation
Getaway vehicle and gun examined in hunt for killers of Christopher Zambra
Judge had criticised senior gardai involved in Zambra case
John Carroll was shot dead in Grumpy Jacks in The Coombe in 2009
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