Bullocks attended Hixson High School[1] in Chattanooga, Tennessee, along with his brother Josh from 1997 to 2001. Daniel and Josh were both multi-sport standouts participating in track and field, as well as excelling in football. Daniel played quarterback throughout his high school career while Josh played running back. The Bullocks brothers led the Hixson Wildcats to four consecutive TSSAA football playoff appearances. Daniel and Josh were heavily recruited by several NCAA Division I schools including the University of Tennessee before deciding to attend the University of Nebraska. Daniel and Josh both graduated from Hixson High School in 2001.
Bullocks was selected by the Detroit Lions in the second round of the 2006 NFL draft.[2] He played 31 games for the Lions, starting in 21.[3] He was waived and subsequently placed on injured reserve on August 19, 2009. The Lions re-signed Bullocks on April 20, 2010. The Lions released him on July 8, 2010.[4]
In 2017 Bullocks became the 49ers assistant defensive backs coach a position he would hold for two years.[7] In 2019 Bullocks was promoted to the safeties coach for the 49ers.[8]