Sydney family begs alleged hit and run driver who killed grandfather to come forward

A heartbroken family of a grandfather allegedly killed in a hit and run in Western Sydney have pleaded with the driver involved to turn themselves into police.

Damodor Shrestha, 79, was out for a walk on Abell Road in Melonba about 11.45pm yesterday when he was allegedly hit by a purple coupe and left to die on the side of the road.

His granddaughter, Surabhi Shrestha, only discovered what had happened when she went out to search for him and came across police around his body.

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She was forced to deliver the devastating news to her grandmother, who had been searching with her.

"My grandma was next to me. She doesn't speak English. She doesn't understand English. So she was asking me what was going on," she told 9News.

"I had to tell her what had happened.

"I think that may have been the hardest word of my life. I didn't know how I don't know how I got the words out to her."

The elderly couple were visiting from Nepal and had been staying at the family home.

Police have released CCTV footage in their appeal for information about the driver who had fled the scene and is believed to have damage to the left side of their car.

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Officers said they are certain the driver would have known they had hit someone.

Shrestha has urged them to come forward and apologise to her family.

"Please, just my grandma, she can barely sleep, she can barely eat, just distraught," she said.

"Just please please step forward. Apologise to my grandma, she's come here all the way from Nepal.

"If you'd stopped, if you helped him, maybe he'd still be with us."