Investigators still don’t know why two brothers were attacked this week after they supposedly got lost on Johns Island, a sheriff’s spokesman said Friday.

Kadeem Chambers, 20, of Longs in Horry County was fatally shot as he drove a Mercedes sedan on Cynthia Avenue before midnight Wednesday. His brother, 17-year-old Jujuain Hemingway, was also in the car but managed to run to safety after getting beaten by two assailants, according to reports.

A small, dark car sped away, but the two people inside have not been identified, said Maj. Jim Brady, a spokesman for the Charleston County Sheriff’s Office. Also unknown is why the brothers were on Johns Island and whether a crime was taking place before the gunfire began on the residential street.

Hemingway has told the authorities that they “got lost during their travels,” an incident report said.

Deputies found Chambers’ car crashed on the roadside. Hemingway was found hiding from his attackers in a portable toilet on a nearby property.

“There was a small baggie (of marijuana) found on a foot path between the locations,” Brady said. “But there’s no way to attribute it to anyone involved.”

Found on the pavement were a lighter and a single dollar bill, according to residents, who said they have suspected drug activity in the community. They insisted, however, that it is not rampant.

Chambers had one arrest in South Carolina on a charge of possessing a controlled substance in 2010, according to the State Law Enforcement Division. The case was not prosecuted.

Hemingway has no arrest record.

In a Facebook post, Hemingway lamented the death of his loved one, telling his brother to “shine bright in heaven.”

Reach Andrew Knapp at 937-5414 or twitter.com/offlede.

Andrew Knapp is editor of the quick response team, which covers crime, courts and breaking news. He previously worked as a reporter and copy editor at Florida Today, Newsday and Bangor (Maine) Daily News. He enjoys golf, weather and fatherhood.