"Why did you leave her?"

The mother of a young woman killed in a hit-and-run crash on Hunt Highway Thursday morning wants answers about her daughter's death.

Carla Lara spoke exclusively to AZ Family at her Florence home Saturday night.

She's devastated, and looking for answers about why this happened.

Her daughter, 25-year-old DesRay Lara, died in the Thursday accident.

She described her daughter as funny and outgoing with plans on becoming a drug abuse and suicide prevention counselor.

[RELATED: PCSO IDs hit-and-run victim killed on Hunt Highway]

The man believed to have hit Lara is Johnson Utilities work truck driver, 42-year-old Marcigtan Winfrey Sr. of San Tan Valley.

Winfrey turned himself in Friday, more than a day after the crash.

"You left her out in the cold for six hours," said Lara. "How would you have felt if it was your child? Now we’re never going to see our little girl again."

Winfrey was booked on suspicion of leaving the scene of a fatal collision, PCSO spokeswoman Navideh Forghani said. 

[RELATED: PCSO: Johnson Utilities truck driver arrested after fatal hit-and-run]

The collision occurred on Hunt Highway between Johnson Ranch Boulevard and Thistle Trail.

PCSO says Lara bought a cup of coffee at the Copper Basin Chevron in San Tan Valley early Thursday. She was then hit sometime between 1:00 and 1:30 am on the highway,

Two people, including a different Johnson Utilities employee, called 911 after discovering her body just after 7 a.m.

The suspect had “texted his supervisor claiming he hit a barricade and had some damage to the vehicle,” according to Forghani.

"I can’t comprehend how he left her, just left her there and drove away and went back to work for two more hours," said Lara.

Forghani said Johnson Utilities has fully cooperated with the investigation.

The company released the following statement:

Our company is saddened by the loss of life which has occurred, and we are in full cooperation with the authorities. At this time, we do not have any further information other than what has been provided to us by the Pinal County Sheriff's Office.

DesRay Lara leaves behind two young children, ages four and one.

"He took our daughter," said Lara. "She was 25 years old. A mother of two. One- and four-year-old that will never hear her voice."

Click/tap here to download the free azfamily mobile app.

Copyright 2017 KPHO/KTVK (KPHO Broadcasting Corporation). All rights reserved.