 The October 1890 murder of Police Chief David Hennessey resulted in the lynching of eleven suspects Between July 24 and July 28, 1900, a violent suspect Robert Charles resisted arrest and killed four police officers and mortally wounded one.In 2014, Superintendent Ronal W. Serpas retired from the New Orleans Police Department after 21 years of service.Before retiring, Superintendent Serpas attained the civil service rank of major and the appointed position of assistant superintendent of the NOPD.