GANG boss "Fat" Freddie Thompson failed to attend the funeral of his uncle, who died in jail at the weekend.
Drug dealer John Brannigan was found dead in his cell in Wheatfield Prison on Sunday.
The 49-year-old, who was a chronic drug addict, had been serving an 11-year sentence for dealing. It is believed he suffered a heart attack.
Brannigan was the father of one of Thompson's closest friends, Liam Brannigan.
Family and friends attended yesterday's funeral at St Catherine's Church on Meath Street, Dublin, but Thompson (32) was nowhere to be seen.
It is believed he married his long-term partner, Vicky Dempsey on New Year's Eve.
Mourners were told Brannigan's daughter, Danielle, could not make it to the funeral because she was in Australia.
The priest celebrating the Mass described him as a happy-go-lucky man who had "ups and downs in his life". He also said he was a dedicated father and grandfather.
After the Mass, Brannigan's remains were brought to Mount Jerome Crematorium.
His nephew Thompson is currently on bail in Spain over an investigation into crime kingpin Christy Kinahan.
Officers there suspect that Thompson worked for the drug cartel boss by dealing his drugs and laundering his money.
The Spanish authorities want to question him in relation to three specific offences -- participation in an organised crime gang, arms trafficking and drugs trafficking.
Up to 30 members of the Kinahan mob were arrested by Spanish police in May 2010 in a high-profile investigation codenamed Operation Shovel.
Brannigan was given a 15-year prison sentence, with the final four suspended, in 2010 after he pleaded guilty to possession of drugs for sale or supply at his home on six dates.
The drugs seized by gardai included heroin, cocaine and crack cocaine that Brannigan had made by himself. The values of the illegal substances that were recovered ranged from ¿3,000 in one search to more than ¿20,613 during another.
At the time, judge Katherine Delahunt said that it was an "extraordinary case" because Brannigan had been dealing drugs from one location for a year and a half, having been caught six times.