Members of a mosque in Denver warned the feds that a man accused of killing a city transit worker execution-style is a radical Muslim with violent tendencies, ABC news reported Friday.

Joshua Cummings, 37, vowed to “fight” for his religion at a mosque event, mosque members warned the Department of Homeland Security (DHS) in a December email.

Leaders at the mosque had arranged for Cummings to meet with “knowledgeable Imams,” to “see if he can be mellowed a bit,” according to ABC.

“But I doubt it would help,” the letter reads. “He is not listening to reason.”

On Tuesday, Cummings allegedly shot a transit worker, Scott Von Lanken, 56, of Loveland, Colorado, in the head as he helped two women with directions.

“Do as I tell you!” he demanded before allegedly pulling the trigger, police say.

The DHS admitted it “did receive the e-mail in question from a community member in Denver.

“It was immediately referred to the appropriate law enforcement agencies for review,” the agency said in a statement Friday.

Cummings is an Army veteran who converted to Islam, according to reports.

It’s unclear when the mosque event occurred.

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