Killed ... Alarna Richardson.

Killed ... Alarna Richardson.

The brother of a young woman who died after a hit-and-run in Sydney’s west has publicly pleaded for information about the crash, saying she was ‘‘the most beautiful person you could meet’’.

Alarna Richardson, 23, died in hospital this morning after she was injured in the crash at the corner of Maud and Ligar Streets, Fairfield West, about 9pm yesterday.

The whole family is shattered ... Alarna we all love you baby 

She was the passenger riding with a 21-year-old male motorcyclist, who remains in a serious condition at Liverpool Hospital.

Police said they believed an early 1990s model Toyota Corolla, possible maroon in colour, was involved in the crash, but didn’t stop.

On Facebook, Ms Richardson’s brother Todd called for anyone with any information to come forward.

‘‘Alarna was only 23 years old and the most beautiful person you could meet,’’ he wrote.

‘‘We all loved her so much and she has never done a thing to deserve something like this to happen and then [to be] just left there.

‘‘The whole family is shattered.

‘‘Please anybody with any info that may help in any way, please contact us or the police straight away.

‘‘Help us find the person responsible, someone must know something.’’

‘‘Alarna we all love you baby.’’

Police said the car they were looking for would have a lot of front end damage.

‘‘The driver of the vehicle involved is being urged to come forward and assist police with their inquiries,’’ police said.

Anyone with information was asked to call Crime Stoppers on 1800 333 000.