Tyrone Gayle, the Washington press secretary for Senator Kamala Harris and a veteran of Democratic campaigns, died on Thursday in Manhattan. He was 30.

His death, at Memorial Sloan Kettering Cancer Center, was caused by colon cancer, according to Lily Adams, Ms. Harris’s longtime communications director.

Despite his youth, Mr. Gayle had worked for several top Democrats, from his time as a driver and body man for Senator Tim Kaine of Virginia in 2012 to serving as a spokesman for the 2016 presidential campaign of Hillary Clinton, the former secretary of state.