Brother charged: A 16-year-old Arlington youth was charged yesterday with malicious wounding in the stabbing of his twin brother, Arlington County police said.

The youth, who was not identified because he is a juvenile, was arrested after he allegedly stabbed his brother in the chest during a dispute Wednesday evening at their home in the 600 block of South Greenbrier Street in the Forest Glen neighborhood. The victim suffered a life-threatening wound, but police said he is expected to survive.

The suspect is being held without bond in the Northern Virginia juvenile detention home.

Help sought: The widow of a Chantilly man who was killed Feb. 23 in a hit-and-run accident pleaded yesterday for the public's help in finding the driver who rear-ended her husband's Toyota as it sat disabled on the shoulder of the Fairfax County Parkway.

Fairfax County police called a news conference yesterday to renew public interest in the death of Emeka R. Nwosu, 48, whose car, investigators have concluded, was probably struck by a red Ford F-250 or F-350 Super Duty pickup truck. Police say the truck would have suffered extensive front-end damage. Nwosu, a father of three who was a site review engineer for Fairfax County, died at the scene of the 2 a.m. crash.

"I need this person to tell me why he didn't stop to help," said Nwosu's wife, Edith, tears streaming down her cheeks. If he had, "my husband could . . . have said goodbye to his children." Anyone with information is asked to call Fairfax County Crime Solvers at 1-800-673-2777. A $6,000 reward is being offered.

Compiled from reports by staff writers.