Miller was born in Los Angeles, California. She earned a Bachelor of Arts degree in Journalism from Howard University and holds a Master of Science degree in Urban Studies from the University of New Orleans.
From 1994 to 2003, Miller lived in New Orleans and worked as a reporter and anchor for WWL-TV, the CBS affiliate. For three of those years, her broadcast, "The Early Edition" was the highest rated newscast in its time slot across the Nation. Also between 1998 and 2001, Miller taught communications and broadcast journalism at Dillard University.
Miller received an Edward R. Murrow Award in 1998 and the Woman of the Year Award from the National Sports Foundation. She also received the National Association of Black Journalists Award of Excellence in 1997.
In 1988, Miller served as an intern at Nightline and the Minneapolis Star Tribune. From 1989 to 1990, she wrote for the South Bay and Valley editions of the Los Angeles Times. From 1990 to 1993, she worked as an Assignment Editor, Producer and Reporter for Orange County Newschannel in Santa Ana, California. From 1993 to 1994, she was a reporter and Weekend Morning anchor at WIS-TV in Columbia, South Carolina.
Miller is married to Marc Morial, President and CEO of the National Urban League and former New Orleans mayor. She and her husband have a son, Mason, born in 2002, and a daughter, Margeaux, born in 2005.