Maher was born in the state of Michigan, just outside of Detroit.

Her birth parents were high school seniors unable to provide for Maureen and subsequently gave her up for adoption.

In 1991, she graduated from Loyola University with a Bachelor of Arts degree in communications. She currently lives in Chicago, Illinois.

Maureen Maher started her broadcasting career with a Chicago based WLUW (FM) as morning drive news anchor in 1991. Maher then moved to Detroit in 1992 where she worked as a reporter for Detroit-based TV station WJBK-TV and CBS-owned radio stationWWJ (AM) until 1995. In 1995–1997, Maher worked as a news anchor for WJRT-TV in Michigan, covering breaking news, including the Oklahoma City bombing and the Decker farm raid.

From 1997 to 2002, she was a Chicago-based CBS Newspath correspondent and covered notable stories such as the impeachment of Bill Clinton, the Kosovo crisis and the release of US servicemen in Albania.

Maher then moved to Dallas and worked as a CBS News correspondent from 1999 to 2002. She reported for CBS Evening News on the War on Terror, the fall of the Taliban in Afghanistan, the 2002 Kenyan hotel bombing, the Enron scandal and US natural disasters.

Maher reported on the Scott Peterson murder trial and a 2003 Chicago porch collapse resulting in 13 deaths.

In 2003, Maher was assigned to host 48 Hours Mystery, a CBS true crime documentary and news program broadcast

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