He was born on October 26, 1990 in Bellflower, CA, where he graduated from St. John Bosco High School. His father, Leon Sr., played shortstop and outfielder for the Houston Astros (1968-70). He enrolled at San Diego State as a wide receiver but converted to cornerback before his freshman season. He wound up starting six of 12 games, recording 26 tackles, one tackle for loss, one sack, one interception and two blocked kicks as a true freshman. He earned Mountain West All-Academic honors that year as well. As a sophomore he started all 13 games at cornerback, recording 55 tackles, seven for loss, one sack, two interceptions, 12 passes defended and one fumble recovery. On special teams, he added five punt returns for 46 yards (9.2 avg). He earned MWC All-Academic honors for the second consecutive year and was named to the first-team all-conference team for his work on the field. As a junior he started all 13 games, tallying 46 tackles, three for loss, one sack, two interceptions, 13 pass breakups and two fumble recoveries on his way to first-team All-MWC honors again. He also recorded two rushing attempts for five yards (2.5 avg) and 12 punt returns for 70 yards (5.8 avg). He earned first team All-MWC honors for the third year in a row as a senior, starting all 13 games. He finished the year with 61 tackles, two tackles for loss, three interceptions including two returned for touchdowns, 12 pass breakups and a forced fumble. He was originally selected by the Cleveland Browns in the third round (68th overall) of the 2013 NFL Draft.
He was signed by the Cleveland Browns on July 20, 2013 ... Cut by the Browns on August 30, 2014 ... Signed by the New York Jets on August 31, 2014 ... Cut by the Jets on September 11, 2014 ... Signed by San Francisco 49ers to their practice squad on September 15, 2014 ... Promoted by 49ers to active roster on November 1, 2014 ... Cut by 49ers on September 5, 2015 ... Signed by Arizona Cardinals to their practice squad on September 8, 2015 ... Signed by New York Giants off Cardinals practice squad on October 21, 2015 ... Cut by Giants on December 5, 2015 ... Re-signed by Giants to practice squad on December 8, 2015 ... Re-signed by Giants to futures contract on January 5, 2016 ... Cut by Giants on September 3, 2016 ... Signed by Dallas Cowboys to practice squad on October 24, 2016 ... Promoted by Cowboys to active roster on November 5, 2016 ... Placed on injured reserve by Cowboys with hamstring injury on August 29, 2017 ... Cut by Cowboys on September 2, 2017 ... Signed by Atlanta Falcons on December 4, 2017 ... Re-signed by Falcons on March 13, 2018.