Q:What key details about william walker -lrb- jockey -rrb- can be extracted from the following bio? Bio: william '' billy '' walker -lrb- 1860 - september 20 , 1933 -rrb- was an african-american jockey . born a slave in near versailles , kentucky , billy walker was the leading rider at churchill downs in the fall racing season of 1875-76 and the spring campaigns of 1876 through 1878 . he was the winning rider aboard ten broeck in a famous july 4 , 1878 , match race at louisville , kentucky , against the great california mare , mollie mccarty . for owner dan swigert and future u.s. racing hall of fame trainer edward d. brown , he rode baden-baden to victory in the 1877 kentucky derby . walker made his fourth and final appearance in the 1896 derby , finishing seventh . he retired that year but stayed in horse racing as a trainer and as an adviser to renowned breeder , john e. madden . billy walker died in 1933 and was buried at the louisville cemetery at the corner of eastern parkway and poplar level road . during the 1996 kentucky derby week , churchill downs erected a headstone on his previously unmarked grave with an epitaph outlining his career .
A:
- updated is march 13 , 2007- death date is september 20 , 1933- horses is ten broeck , baden-baden- race is match -rrb- race -lrb- 1874 -rrb- kentucky derby -lrb- 1877- birth date is 1860- name is billy walker- birth place is versailles , kentucky- occupation is jockey