Horrall had become chief when Hohmann, under pressure from Los Angeles Mayor Fletcher Bowron, voluntarily took a demotion to deputy chief after he had become ensnared in a police corruption trial that had embarrassed the mayor.

[2] During his tenure as chief many significant events occurred that would shape Los Angeles during the decade of the 1940s, when the population of the city proper surged from 1.5 million to nearly 2 million people.

Events such as World War II, Japanese-American relocation and internment (see Japanese American internment), the Zoot Suit Riots of 1943 and the Black Dahlia homicide roiled the city, as did the Brenda Allen vice scandal of 1948–49 that led to Chief Horrall's resignation after it was found that officers involved with the Hollywood madam perjured themselves under oath during grand jury testimony, as did Horrall himself.

[3] Clemence Horrall died in 1960 from a heart attack and was buried in Forest Lawn Memorial Park, by Hollywood Hills.

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