McCormick played the eldest daughter, Marcia, who had five siblings.
She had a perky and popular personality in The Brady Bunch, an American television sitcom about a blended family that aired from late 1969 to early 1974 on ABC, on Friday nights.
After its cancellation, the series was later rebroadcast in syndication for decades, as children's programming, gathering long-lasting, cross-generational popularity that led to spinoffs and movies.
McCormick had a sporadic romance with her Brady Bunch co-star Barry Williams during the original series' run.

McCormick recorded four albums with the Brady Bunch cast and toured with them as well.
In 1972, she released her first solo single with the songs "Truckin' Back to You" and "Teeny Weeny Bit (Too Long)".
The following year, McCormick recorded an album with her Brady Bunch co-star Christopher Knight, a pop extended play titled Chris Knight and Maureen McCormick, which carried both duets and solo tracks.
McCormick's second solo single "Little Bird", backed with "Just a Singin' Alone", had mild chart success in the western United States (reaching Top 5 at KCPX in Salt Lake City).
McCormick later performed "Little Bird" on American Bandstand, where host Dick Clark encouraged her to follow a singing career.
McCormick released another single in 1973, "Love's in the Roses", backed with "Harmonize".

In 2015, archive footage of McCormick as Marcia was used for an American TV commercial advertising Snickers chocolate bars.
The commercial, which debuted during Super Bowl XLIX, features action film star Danny Trejo as young Marcia who (in the context of being hungry) isn't acting like herself.
After eating a Snickers, Marcia appears as McCormick once again.
McCormick played the eldest daughter, Marcia, who had five siblings. She had a perky and popular personality in The Brady Bunch, an American television sitcom about a blended family that aired from late 1969 to early 1974 on ABC, on Friday nights. After its cancellation, the series was later rebroadcast in syndication for decades, as children's programming, gathering long-lasting, cross-generational popularity that led to spinoffs and movies. McCormick had a sporadic romance with her Brady Bunch co-star Barry Williams during the original series' run.
McCormick recorded four albums with the Brady Bunch cast and toured with them as well. In 1972, she released her first solo single with the songs "Truckin' Back to You" and "Teeny Weeny Bit (Too Long)". The following year, McCormick recorded an album with her Brady Bunch co-star Christopher Knight, a pop extended play titled Chris Knight and Maureen McCormick, which carried both duets and solo tracks. McCormick's second solo single "Little Bird", backed with "Just a Singin' Alone", had mild chart success in the western United States (reaching Top 5 at KCPX in Salt Lake City). McCormick later performed "Little Bird" on American Bandstand, where host Dick Clark encouraged her to follow a singing career. McCormick released another single in 1973, "Love's in the Roses", backed with "Harmonize".
In 2015, archive footage of McCormick as Marcia was used for an American TV commercial advertising Snickers chocolate bars. The commercial, which debuted during Super Bowl XLIX, features action film star Danny Trejo as young Marcia who (in the context of being hungry) isn't acting like herself. After eating a Snickers, Marcia appears as McCormick once again.
Maureen McCormick