The iconic hillside sign overlooking Southern California's film-and-television hub was defaced overnight in honor of marijuana.
Residents awoke on Sunday to find "Hollyweed" staring down at them in four-story, white letters from Los Angeles' Mount Lee, where a version of the picture-ready "Hollywood" sign was first erected in 1923.
City surveillance cameras captured footage of someone dressed in black about 3 a.m. (1100 GMT) whom police believe was behind the conversion, Sgt. Robert Payan of the Los Angeles Police Department said in a phone interview.
Material similar to a tarp was placed over the two O's to make them appear as E's, and park rangers were assessing how to remove them, Payan said.
There were no suspects, but the person if caught could be charged with misdemeanor trespassing, he said.
Rapper Snoop Dogg, a noted cannabis consumer, tweeted a photo of the sign on Sunday and said: "#hollyweed - that's were I get my mail. #merryjane."
The Hollywood sign remains a popular spot for hikers and tourists, who used to be able to walk up to the sign and take a picture. Now, a fence blocks people, and accessing the sign is difficult.
The famed vista with the Hollywood sign was nearly spoiled by development in 2010 until a conservation group, with donations from Playboy magazine founder Hugh Hefner and others, purchased adjacent land to save the view.
The sign originally read "Hollywoodland" and was created to promote a housing development. The last several letters deteriorated in the late 1940s, and the part that remained was restored in 1978.