Arlington County Police yesterday were investigating the suspicious death of a recent college graduate early Saturday in a car on southbound Interstate 395.
Simran Singh, 21, of Burke, was a passenger in a car with four other occupants leaving the District about 1:20 a.m. when, police said, he reportedly "became violent."
The other occupants, whom Mr. Singh knew, restrained him.
"After a short period of time, they noticed that Mr. Singh was not responsive," police said.
Within an hour, Mr. Singh was taken to Inova Alexandria Hospital and pronounced dead. Other occupants had minor injuries, a police spokesman said earlier this week.
None of the four other occupants was in custody yesterday, and no charges have been filed. Their names were not released.
A spokesman for Mr. Singh's family yesterday said relatives of Mr. Singh are following the investigation closely.
"They're concerned and want to know why the other occupants of the car were released so early in the investigation," said the spokesman, who did not want to be identified.
"They also don't know what kind of testing was done on the occupants to support further investigation," he said.
Detective D.R. Cupka, of Arlington's robbery and homicide unit, declined to discuss specifics of the investigation.
He said the investigation remains active and the department will present its findings to the Office of the Commonwealth Attorney, which ultimately will decide whether to prosecute criminally. No cause of death has been determined.
In the first days of the investigation, Arlington police were working on the case with Metropolitan Police detectives. But Detective Cupka said both jurisdictions agreed that Arlington police should investigate the case.
Hundreds of friends and family attended Mr. Singh's funeral in Fairfax yesterday. Mr. Singh was preparing to pursue his master's degree in business management.