A U.S. Census worker was killed while dropping off a co-worker in Southwest Baltimore last week, according to police and the census bureau.

Spencer Williams, 22, was found shot June 7 inside his vehicle, which had pulled onto a median in the 1100 block of New Hope Circle, police said. He died Friday morning at Johns Hopkins Hospital.

Williams was a crew leader responsible for a group of census takers who are doing follow-up visits to homes of people who did not mail in their questionnaire by April, a Census bureau spokeswoman confirmed. Malkia McLeod confirmed a Washington Post report that Williams was returning home after driving a co-worker home at the end of the day, and was considered to still be on the job.

Police and census officials said the shooting is not believed to be related to any census field work but is considered an on-the-job death. Officials were exploring whether it the shooting was domestic related.

Since the census began making follow-up house calls in late April, workers have been harmed or threatened 252 times, McLeod said. That includes 11 times when shots were fired at them, and 86 times when they were threatened with weapons such as guns, axes and crossbows.