Slain Brisbane GP Dr Luping Zeng laid to rest

A much-loved Brisbane GP has been farewelled at an emotional funeral service.

The funeral of Luping Zeng, 56, was held in the city. Images from his life were shown at the service.

Police say Mr Zeng was the victim of an alleged attempted armed robbery earlier this month.

He was in the garage of his MacGregor home at 11.40pm when he was killed on April 15.

Dr Zeng had three decades of medical experience, spoke three languages and was a highly regarded member of Brisbane's Chinese community.

He moved to Australia in 2000 and worked at the Waterford 7-Day Medical Centre and Skin Cancer Clinic.

His patients reacted to the news of his death with disbelief, remembering his gentle and compassionate nature.

Two teenagers and a young man accused of murdering the doctor at his home have since fronted a Queensland court.

Joshua Hamilton, 19, Billy Smith, 20, and a 17-year-old boy, who cannot be named for legal reasons, are charged with the shooting murder of Mr Zeng, 56.

Bail was not applied for and all three were remanded in custody.

They have also been charged with entering a dwelling with intent, attempted robbery with violence, possession of shortened firearms and unlawful use of a motor vehicle.

Police believe the trio didn't know Dr Zeng and robbery was likely to be the motive behind his killing.

Dr Zeng's wife and two adult children were at home when the shooting occurred.

He was taken in a critical condition to Princess Alexandra Hospital where he died.