A 13-year-old Rogue River girl killed Monday morning while waiting for the school bus died from a blow caused by a vehicle part such as a mirror or cargo extension, according to autopsy findings, and detectives say it's possible the driver didn't realize he hit a person.

It had been trash day the morning Meadow Grace Boyd was found on the ground with fatal injuries outside her driveway at 7:29 a.m. in the 5100 block of East Evans Creek Road outside Rogue River, Jackson County sheriff's Sgt. Julie Denney said. It was dark and foggy at the time, and black trash canisters lined the road. Denney said it's possible a driver knew he hit something without knowing he'd hit someone.

"It's kind of an unusual circumstance," Denney said.

Thanks to surveillance videos and tips, the sheriff's office said detectives are beginning to narrow their focus in finding a suspect, but police are asking anyone with information to come forward.

"We definitely want to hear from more people if they have something to share," Denney said.

Meadow could have been struck by any number of vehicle extensions, including a side-mirror, part of a trailer, a cargo item in a pickup bed or a top- or side-mounted rack, according to Denney, based on the autopsy and evidence gathered at the scene.

Meadow was the youngest of four siblings in a "close-knit" family, according to Denney. Denney relayed a request to speak with family members, but she said they aren't yet ready to talk with the media.

Denney said her family described Meadow as a "protector," someone who stood up and helped people being bullied. She was small in stature and enjoyed rock climbing, time in the outdoors and reading. She loved animals, including horses and her dog, Wicket.

Family members are hoping someone will come forward with information to help them understand what happened to Meadow, Denney said. Anyone with information about this case is asked to call detectives Steve Bohn or Gabe Burchfiel at 541-774-6800.

— Reach reporter Nick Morgan at 541-776-4471 or nmorgan@mailtribune.com. Follow him on Twitter at @MTCrimeBeat.