A grief-stricken mom says she hopes a Massachusetts man "burns directly in hell" over the road rage incident that killed her 26-year-old daughter.

Tracy Decoff vented her fury at Ryan Sweatt, 36, on Facebook the day after he allegedly ran down Destini Decoff on Route 85 in Hopkinton, Massachusetts, about 25 miles west of Boston.

"With every ounce of my being I hope that mf burns directly in hell!" she wrote.

The deadly incident unfolded around 6 p.m. on Thursday, when Sweatt allegedly made a U-turn and sped toward a group of people who got out of another vehicle after its driver tangled with him.

Destini Decoff was struck and thrown "several feet in the air," a prosecutor said at Sweatt's Friday arraignment, Boston TV station WBZ reported.

Witness Brett Martin said he rushed out of nearby Cornell's Irish Pub after hearing tires screech.

"I saw her mid-air, kind of coming down towards the street," he told WBZ. "Her jacket must've been 20 feet away from her. However she got hit, those clothes flew off."

Sweatt was charged with assault and battery with a dangerous weapon and related offenses.

He pleaded not guilty at his arraignment and was ordered held without bail, WBZ said.

Sweatt told authorities that he was heading home from work when another driver pulled in front of him and slammed on the brakes, WBZ reported, citing court records.

Destini Decoff and four unidentified then got out of that car, surrounded Sweatt and allegedly threatened him, he said.
It's unclear who was driving the second vehicle.

Destini Decoff was "literally injured from head to toe" and was placed on life support following hours of surgery for bleeding in her brain and other wounds, her mom wrote.

Officials said Destini Decoff died of her injuries on Saturday, the Boston Globe reported, with Traci Decoff saying on Facebook that "my biggest fear as a mother became my reality."

"My first born child & best friend is no longer with me," she wrote early Sunday.

A spokesperson for the Middlesex district attorney's office told USA Today that the charges against Sweatt haven't been upgraded but that the case remained under investigation.