The murder last July of an employee of the Democratic National Committee received renewed attention from news media outlets on the right this week when a private investigator and longtime Fox News contributor said that there was “tangible evidence” that the employee, Seth Rich, had contacted WikiLeaks before his death.

The investigator has since given shifting and contradictory accounts to other news organizations, and Mr. Rich’s family has grown increasingly distressed, calling the politicization of his death “painful” and “debilitating” and asking for retractions and apologies from the Fox outlets that promoted the investigator’s story.

What do we know about Mr. Rich’s murder?

Seth Conrad Rich, 27, worked for the committee for a little more than a year. He was shot in the back in July near his home in the Bloomingdale neighborhood of Washington, D.C.

Mr. Rich’s murder is still under investigation by Washington’s Metropolitan Police Department.

The police in Washington responded to the sound of gunshots early in the morning of July 10 and found Mr. Rich, who was still conscious, at an intersection in Northwest Washington near his house. Mr. Rich was taken to a hospital, where he died a little more than an hour later.