Sen. Ted CruzRafael (Ted) Edward CruzMcSally, staff asked to break up maskless photo op inside Capitol Capitol's COVID-19 spike could be bad Thanksgiving preview Republican senators urge Trump to label West Bank goods as 'Made in Israel' MORE (R-Texas) tweeted a letter from the Zodiac Killer in an apparent Halloween joke Wednesday.

The once-popular meme that Cruz is the Zodiac Killer emerged during the 2016 Republican presidential primary. The letter shows the Zodiac's cryptography, which he sent to newspapers during his killing spree.

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Five people in Northern California were killed by the Zodiac, who was never identified, in the late 1960s and early 1970s.

Cruz's wife, Heidi, denied her husband being the Zodiac killer, calling it “a lot of garbage." Cruz was born two years after the first killings.

Cruz had previously tweeted this image last year joking with Sen. Ben SasseBen SasseHogan 'embarrassed that more people' in the GOP 'aren't speaking up' against Trump Democrats gear up for last oversight showdown with Trump GOP senator congratulates Biden, says Trump should accept results MORE (R-Neb.) about a soda that he spilled on Cruz.

The Republican senator is locked in a tight reelection campaign with Rep. Beto O'RourkeBeto O'RourkeMexico emerging as foreign policy challenge for Biden Beyoncé sports pro-Biden mask on Instagram Harris to travel to Texas Friday after polls show tie between Trump, Biden MORE (D-Texas). The nonpartisan Cook Political Report rates the race a "toss-up."