ST. LOUIS (KMOX) – The mother of a 7-year-old boy killed outside the St. Louis Zoo hopes to block early parole for the drunk driver who took his life.

Three years ago, Angie Maue sat in the same room as her son’s killer to explain why Robert Robertson should remain locked-up.

Early next month she’ll face him again in another parole hearing.  “He just needs to hear what our life has been like and all the things we’ve missed and all the things that we go through on a daily basis because of a poor choice that he made.”

Robertson’s blood alcohol level was three times the legal limit on the May 2001 afternoon his car jumped the curb outside the St. Louis Zoo, striking and killing Luke Maue.

If denied parole, Robertson will spend another three years in prison before his conditional release.