"If you know something tell something," one man attending Friday's vigil for Davis, said.
The young woman was found murdered, her torso discovered by Detroit firefighters responding to a Plymouth Voyager on fire April 3.
Neighbors on Westbrook at Kendall near Schoolcraft and Burt roads say the van was dumped at 11 p.m. April 2 and by 9:30 a.m. the next morning, the van was fully engulfed in flames.
"Monsters," said Jasmine Massey, Davis' cousin. "We couldn't even imagine something like this."
The mother of Ronda Davis wore a white shirt and was overcome with grief at the vigil. Ronda's grandfather says the entire family has been emotionally destroyed.
"I can't even describe the sadness," said William Teague, Davis' grandfather. "My whole family is distraught. You can see by the turnout for the vigil.
"She was just the darling of this family and we're going to miss her.
Those attending the vigil planted candles, flowers and plastic butterflies at the site where Ronda Davis body was found.
"They are beasts," Teague said. "Whoever they are, they ought to be removed from society."
Investigators have some leads but want more tips.
Teague said he was at work when he saw the report on the news.
"I am a nurse and I was passing my pills and I saw it on the TV that they found a woman's body burned in a field," he said. "I had no idea it was my granddaughter. I didn't know it was my granddaughter until Easter morning at about 12 p.m."
"She was a sweet wholesome girl, she was young, family-oriented," Massey said. "God bless whoever did this and we pray for them all."
Anyone with information is asked to call Detroit police at (313) 596-5300 or Crime Stoppers at 1-800-SPEAK-UP - which allows you to remain anonymous.