BELMONT, N.C. -- A Charlotte woman who turned herself in to Belmont police early Friday after a deadly hit-and-run is not charged in the case, and the victim’s family is upset.

Police said 48-year-old Charla Dean Davis was behind the wheel of a silver Saturn Vue that hit three people on Wilkinson Boulevard just before 10 p.m. Officers said her damaged SUV was found abandoned in a Mount Holly neighborhood hours later.

Investigators said the accident happened when another SUV driver, 57-year-old Calvin Adams, began having a seizure or stroke and pulled over on the U.S. 74 bridge over the Catawba River in Belmont. Adams’ passengers got out to help him, and the driver of a tractor trailer also stopped to help.

The Saturn Vue hit the three people on the road and took off, police said. The three Good Samaritans and the Adams were rushed to the hospital.

The tractor trailer driver, 40-year-old Ronnie Eudy, died at about 2 a.m. Calvin Adams, who was not struck by the SUV, and his passenger Betty Faye Adams are in critical condition. Adams’ passenger 47-year-old Jerry Ames Leach was treated and released from the hospital Friday morning.

Four others who were in Adams’ SUV were not injured.

After Davis turned herself in to police, she was interviewed for several hours and released. Police said she admitted to striking the three on the roadway.

“There's nothing in the law that says you have to arrest somebody right now,” said Belmont Police Chief David James.

James said investigators are waiting to bring charges because they want to make sure they interview everyone involved. He said what they find out could lead them to charge Davis with manslaughter.

Officers will present the facts of the case to the district attorney on Monday, who will determine whether to file charges.

“Well, was she impaired? Did she just run away and stay hid until she sobers up? You know, what're the factors there,” he said.

The lack of charges doesn’t sit well with Mildred Martin. She said it was her son-in-law who stopped to help a stranger and was hit and killed.

“That was him. That was Ronnie. He would stop and help anybody,” she said.

She said she doesn’t know if Davis could have helped after the crash, but she wonders why the woman didn’t stop.

An Eyewitness News crew went to Davis’ home but no one answered the door.

Davis was charged in Mecklenburg County with driving while impaired in 2005.

Police said they’ll present their findings to the district attorney on Monday.

RAW AUDIO: 911 Call After Deadly Hit-And-Run