FBI special agents have tracked down an American woman, currently on their most-wanted list, to Adelaide after an international search spanning seven months.

Key points: US authorities allege Andrea Dorothy Chan Reyes hit Agustin Rodriguez Jr in 2017

US authorities allege Andrea Dorothy Chan Reyes hit Agustin Rodriguez Jr in 2017 Her car was found using its internal GPS system

Her car was found using its internal GPS system She was arrested by Australian Federal Police in Adelaide in April

Andrea Dorothy Chan Reyes, 33, is facing extradition to the United States after she allegedly hit and killed cyclist Agustin Rodriguez Jr in January 2017 and fled the scene.

Documents from the United States District Court allege Ms Chan Reyes was travelling at a "high rate of speed" when she hit the 46-year-old man, who was dragged about 270 metres under her sports car.

The court documents stated that she did not stop to help the cyclist, as is required by law, and instead continued driving at an "unsafe speed" on the wrong side of the road.

Later that same day, Ms Chan Reyes took her white Lexus, which had a broken windscreen and damage to the front bumper, headlight and front area of the roof, to a repair shop in California where she told staff she had hit a deer.

She flew to Hong Kong — where she had family ties — five days after the fatal hit-and-run in a move the FBI claimed was "with the intent to avoid prosecution".

Within an hour of the collision on January 30, the Whittier Police Department issued a press release seeking the public's help in any information about a white Lexus involved in the hit-and-run.

Police issued a press release shortly after Agustin Rodriguez Jnr's death seeking information. ( Facebook: Justice For Agustin )

It was a tip-off from a woman, believed to be a colleague of Ms Chan Reyes, more than a week after the crash that alerted police that she could be the owner of the white Lexus involved in the incident.

The woman told police Ms Chan Reyes drove a white Lexus and had been late to work on the day of the crash.

About four weeks later, in March 2017, police officers used the car's internal GPS system to track it down to a private garage, which was owned by a business associate of Ms Chan Reyes' boyfriend at the time.

The Whittier Police Department allege they found DNA on the car which matched the victim.

Documents show several trips to Hong Kong

Court documents stated the owner of the garage told police Ms Chan Reyes had told him she had "hit somebody on a bike and left the scene".

An arrest warrant was issued in September 2017.

Court documents show the US citizen, who was born in the Philippines, made several trips between Hong Kong and Australia in August and September 2017.

This week, the Adelaide Magistrates Court heard Ms Chan Reyes was arrested by Australian Federal Police in Adelaide in April 2018 and has been remanded in custody since then.

If extradited, she faces charges of vehicular manslaughter, hit-and-run driving resulting in death or serious injury to another person and destroying or concealing evidence.

Her case will return to the Adelaide Magistrates Court next month.