On February 26th, NPR posted this screenshot of the google search “ted cruz is”: 

“Is ted cruz the zodiac killer” is the second suggestion. Here is a screenshot from today (3/21):

Nothing about the zodiac killer. The conspiracy theory is also absent from any search suggestions for other combinations of ‘ted cruz’ and ‘zodiac killer’. So maybe there’s a reasonable explanation: fewer people are asking google if Ted Cruz is the zodiac killer, and are instead asking if he is republican or married. Nope. Not according to google trends, which shows ‘is ted cruz the zodiac killer’ as a more interesting search term since February. 

Conclusion

Ted cruz got google to remove all search suggestions relating him to the zodiac killer (because ted cruz is the zodiac killer).