Former Houston Mayor Bob Lanier died Dec. 20 at age 89. The Harris County Medical Examiner's Office said he died of natural causes, Click2Houston.com reports, and his wife, Elyse, issued a statement that he passed away peacefully at their home. Lanier, who served as mayor from 1992 to 1998, is considered one of the most popular and powerful mayors in Houston's history, KHOU.com reports. Born in 1925, Lanier was raised in Baytown in a house without indoor plumbing. His passions were politics,…