Walker was born and grew up in Mount Holly, New Jersey, where she attended Rancocas Valley Regional High School and she set school records for career rebounds (851), rebound average per game (14.2 rpg), most rebounds in a game (29), most points in a season (675), and most career points (1,546).

In her senior year, she was named to the 1995 All-American first team by Street & Smith's New Jersey High School "Female Athlete of the Year", and Parade Magazine All-America Second Team as a high school senior.

Walker attended the University of Virginia and played on the women's basketball team (known as The Cavaliers) from 1995 to 1999.

By the time she graduated, she became Virginia's all-time leader in field goal percentage, as well as 330 career blocked shots which at the time was ranked 12th in the NCAA record books. She averaged 13.0 points per game and 6.9 rebounds per game during her career.

Her 1,583 points ranks her ninth in school history.

She was named the "Cavalier of the Year", and was an Honorable Mention All-America selection in her senior year (1998-99 season) after leading the team in scoring, rebounding, field goal percentage and blocked shots.

She is also a member of the Zeta Phi Beta Sorority.

Walker was selected to play with the USA team at the 1999 Pan American Games. The team finished with a record of 4–3, but managed to win the bronze medal with an 85–59 victory over Brazil. Walker averaged 1.6 points per game.

Despite her impressive career in college, Walker was not selected by any of the WNBA teams during the 1999 WNBA Draft, mainly due to the influx of former players from the just-disbanded American Basketball League (ABL), a rival professional women's league. Several of the ABL's star players were selected in that year's draft.

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