WORCESTER - A 20-year-old woman was killed when she was struck by a sport utility vehicle on Grafton Street Tuesday night.

Gabriella Lowell of Worcester was unconscious in the roadway near near Roosevelt Elementary School when officers arrived around 9:30 p.m., police said. She was taken to an area hospital, where she was pronounced dead.

Preliminary investigation indicated the driver of a 2006 Nissan Pathfinder was heading northeast on Grafton Street (Route 122) and Ms. Lowell was walking across the street from east to west, in the crosswalk, when she was hit, police said.

The driver remained at the scene. Police did not release his name, but said a 21-year-old man was driving the SUV.

A memorial has been set up on the side of the street.

On Wednesday, Ms. Lowell's grandfather Ken Garabedian drove by, slowing his car as he passed the memorial: flowers, candles, blue and white star-shaped balloons with messages written across them indicating no one will forget “Gabby.”

Mr. Garabedian said his granddaughter loved to sing and had many friends. She attended Catholic schools in the city and for a short time studied at North High School, he said. She had plans and was considering college.

She had met up with a girlfriend at McDonald’s and was walking home when the accident occurred, he said.

The family got word of an accident Pine Hill Road and Grafton Street, so his wife went up to check because someone had seen Ms. Lowell walking. They were devastated to learn she’d been hit.

Their family is close-knit, Mr. Garabedian said. Ms. Lowell and her mother live with Mr. Garabedian and his wife. Many of the Lowell relatives live on the same street.

“Our house is full,” he said, of those who had come by to comfort them Wednesday afternoon.