The parents of murdered Democratic National Committee staffer Seth Rich penned an op-ed Tuesday asking media figures who have promoted their son's death as a conspiracy theory to stop causing them "unbearable" pain by spreading such "baseless" theories.

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Mary and Joel Rich, Rich's parents, wrote in the Washington Post that instead of having time to mourn their son's death, they are responding to reporter's questions about his murder and whether or not it is part of a conspiracy theory they have previously said there is no proof to support.

"We have seen no evidence, by any person at any time, that Seth’s murder had any connection to his job at the Democratic National Committee or his life in politics. Anyone who claims to have such evidence is either concealing it from us or lying," they wrote.

Seth Rich was shot and killed near his D.C. home in 2016. The case remains open and police have said they believe he died in a botched attempted robbery.

The couple wrote that conservative news outlets have continued to report that Rich's murder was a result of him having handed DNC emails over to Wikileaks.

"Those theories, which some reporters have since retracted, are baseless, and they are unspeakably cruel," they wrote.