'Howard Stern Show' alien expert Riley Martin dead at 69

Riley Martin, a self-proclaimed alien expert and longtime Howard Stern Show contributor, has died at 69.

Martin’s producer, Eron, confirmed to TMZ that Martin died in Bethlehem, Pa., several days before Christmas.

Martin is perhaps best known for his claim that he was abducted multiple times by an alien race called the Biaviians.

Riley chronicled his experience with the Biaviians in his book, The Coming of Tan, which was originally written in 1990, according to his website.

On social media, fans reacted to the news of Martin's death and posted messages wishing him a safe journey to the "mothership."

Howard Stern posted a farewell message to the man that the show called “one of the most notable Wack Packers to ever be heard on the Howard channels.”

"Riley, to me, was one of the greats," Howard said Wednesday in statement. "We love you. We will miss you."

Martin hosted The Riley Martin Show on Howard 101 on SiriusXM, according to the Stern show statement.

On Martin's website, Eron posted a message to fans.

“Riley said to tell you all (I don't know how) that he WILL see you again in the future,” Eron wrote, promising updates on the “last days, and life, of the Ole Space Cowboy.”

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Rest easy, Riley Martin!

Follow @MaryBowerman on Twitter.