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The funeral of the youngest son of Melbourne underworld figure Mick Gatto is under way at St Ignatius Catholic Church in Richmond.

Justin Christopher Gatto died on October 30 - four days after his 34th birthday - after falling from a central Melbourne apartment block.

Mick Gatto arrived at the service on Friday dressed in a black suit, white shirt with a light blue, gold and black tie, his face hidden by Louis Vuitton sunglasses.

Mick Gatto (right) arrived at the church surrounded by friends in dark suits and sunglasses

The funeral of the youngest son of Melbourne underworld figure Mick Gatto is under way at St Ignatius Catholic Church in Richmond

Justin Christopher Gatto died on October 30 - four days after his 34th birthday - after falling from a central Melbourne apartment block

Among the hundreds of people gathered at St Ignatius' Church were underworld figure Toby Mitchell and construction union boss John Setka.

The funeral service began with Louis Armstrong's What A Wonderful World.

Mick and Justin's siblings Damien and Sarah are expected to read a eulogy.

A private burial with family will follow the service.

Mick Gatto arrived at the service on Friday dressed in a black suit, white shirt with a light blue, gold and black tie, his face hidden by Louis Vuitton sunglasses

Among the hundreds of people gathered at St Ignatius' Church were underworld figure Toby Mitchell and construction union boss John Setka

John Sekta (centre) , the outspoken leader of Victoria's Construction Union, arrives at the church Friday morning

Justin Gatto, 34, died near a Spencer Street apartment building in Melbourne's CBD just after midnight last Tuesday. Police said his death was not being treated as suspicious.

He died on October 30 - four days after his 34th birthday - after falling from a central Melbourne apartment block.

'With your happy smile, and sense of fun, we can't believe that you are gone,' read a written tribute handed to mourners.

'You brought so much joy to every life you touched and you are missed, so very much.

'But, a beautiful soul lives on forever and memories of you we will always treasure.'

The message, titled Missing You, also reads rest in peace, 'free from all pain'.  

A silver limousine was spotted pulling into the church ahead of the service

Attendees were teary as they comforted each other outside the church

Justin Gatto, 34, died near a Spencer Street apartment building in Melbourne's CBD just after midnight last Tuesday (Damian far left)

Mick Gatto arrived at the service dressed in a black suit, white shirt with a light blue, gold and black tie, his face hidden by designer sunglasses.

Among the hundreds of people gathered at St Ignatius' Church were underworld figure Toby Mitchell and construction union boss John Setka.

The funeral service began with Louis Armstrong's What A Wonderful World.

Mick Gatto appeared to get be driven to his son's funeral in a silver limousine 

Men embraced each other on at the foot of the steps of the church

There was a sea of sorrow outside the church with attendees spotted chatting in groups (Toby Mitchell centre, right)

Former Bandidos enforcer Toby Mitchell was spotted outside the church

Mick and Justin's siblings Damien and Sarah are expected to read a eulogy.

The closed silver coffin with gold details is expected to be taken out of the church to the song Over The Rainbow by Israel Kamakawiwo'ole.

Mourners were asked to donate to mental health organisation Headspace "in line with Justin's wishes".

A private burial with family will follow the service.

Attendees appeared solemn as they hugged at a location nearby the church

Several people gathered outside the church dressed in dark clothing 

Toby Mitchell was spotted standing by while two aquantances shook hands 

A man dressed in a long black coat faced his back to the church and near the limousine

An elderly attendee opted to wear a shade of brown instead of black

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