A truck driver who allegedly hit and killed a grandmother on the northern Sydney beaches last week fled the scene and threw her clothing in a bin after peeling it off the bottom of his vehicle, police say.

Jo-Ann Thwaites, 60, was hit on Friday morning while using a zebra crossing at the intersection in Brookvale after doing some grocery shopping with her son, Nick.

A 36-year-old Lilydale Chickens driver, who was doing deliveries in the area for the poultry company, allegedly drove off after hitting Thwaites.



A second truck, pictured at the scene with Daikin branding, then hit Thwaites and dragged her up to 600 metres before the driver realised and stopped to help.



The Lilydale Chickens driver has been captured on CCTV disposing of Thwaites' clothes about five kilometres away at the IGA Supermarket at Allambie Heights, police said.



Superintendent Stuart Smith has appealed for witnesses to come forward to help piece together the driver's movements after the fatal crash at 9am and his stop at the IGA.

FACEBOOK Jo-Ann Thwaites pictured with her son Johnathan, on left, Nick, on right, and grand-daughter Cassie.

It's understood several witnesses tried to confront the driver.

He was arrested about seven hours after the crash when police tracked him to Lilydale's Girraween base. He has been charged with failing to stop and render aid after impact causing death and negligent driving.

"We are anxious to learn the movements from the fatality to IGA and then for rest of the day," Smith said.



"This is a very, very serious allegation - one that a family is not going to understand and a community is going to struggle with."



The revelations come as police raided the headquarters of Lilydale Chickens at Girraween business, near Blacktown, on Tuesday morning.



The site houses factory outlets for Lilydale and Steggles chickens and is the headquarters for parent company Baiada.

Peter Rae Police are looking for any widespread issues with driver safety at Baiada.

It's understood officers were looking for any widespread issues with company drivers and truck safety.

In the first two hours of the operation, they found two heavy vehicles that had their speed limiters tampered with, one unregistered truck and 10 trucks with defects including bald tyres and broken brake lights.

"Out of such a small sample that's quite concerning," Smith said.



Thwaites' family said on Tuesday that they can't understand what the first driver was thinking by not stopping.



They have called for a major reassessment of the Brookvale intersection, saying the design is dangerous and the stretch of road should be covered by traffic signals.



Thwaites spent Thursday with her two sons, Nick and Johnathan​, and grand-daughter, Cassie.



Nick, 31, told the Manly Daily that he had been with his mother on Friday morning and had offered to give her a lift home because she had taken her car for a service.



"I offered to pick her up because she would be without a car but she was that into her walking and loved it every morning that she decided she wanted to walk home," he said.



"She had gone via Warringah Mall and done a bit of shopping, got a small amount of groceries and that is when it happened," he said.



It is the second tragedy for the family after Thwaites' husband, Tony, died from suicide in 2013. He suffered PTSD after serving in the army for 40 years.



Johnathan told the Manly Daily they were pleased with how she was progressing since his death.



"She told me she loves walking down to Manly beach, she went for a walk Thursday morning - the day before (she died) and she said she was feeling really good about herself," he said.

FACEBOOK Jo-Ann Thwaites with her late husband Tony.

The second truck driver, who stopped to assist after dragging Thwaites, was taken to hospital for blood and alcohol testing and has not been charged.

The first truck driver had his vehicle seized for forensic examination. He was granted conditional bail to appear in Manly Local Court on June 15.

In a statement, Baiada said they do not own or operate the trucks that have received breaches.

"We will, however, thoroughly investigate any breaches reported to us by police and ensure that they are immediately rectified," the statement said.

"We will move to terminate agreements with any transport companies that do not comply with legal standards."

The statement said staff and management send their "deepest condolences to Ms Thwaites' family".

"We were extremely saddened to hear of this tragic incident," it said.





