Sen. Ted CruzRafael (Ted) Edward CruzDemocrats express confidence in case as impeachment speeds forward Chuck Todd challenges Cruz after senator pushes theory that Ukraine meddled in election Sunday shows — Nadler: A jury would convict Trump in 'three minutes flat' 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 SasseBenjamin (Ben) Eric SasseFCC votes to bar use of its funds to purchase Huawei, ZTE equipment Senate approves stopgap bill to prevent shutdown Trump circuit court nominee in jeopardy amid GOP opposition 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'RourkeButtigieg picks up third congressional endorsement from New York lawmaker Klobuchar hires staff in Nevada Deval Patrick enters 2020 race MORE (D-Texas). The nonpartisan Cook Political Report rates the race a "toss-up."