Walker was born in Hickory, Mississippi.[3] He is also a pop musician.[4] Walker began his acting career in 2006 as a child actor when he appeared on the late-night talk show Talkshow with Spike Feresten.[5] The same year, he worked in two series: 'Til Death as Classroom Kid and Bones as Matty. In the 2008 short film Miss Dirt, he played the character of Miss Dirt's Bully. In the 2008 docudrama film, Front of the Class, where he played the antagonist role of Young Brad's Bully.[6][7]
In 2009, Walker made his film debut in the black comedy film I Love You Phillip Morris starring Jim Carrey and Ewan McGregor.[8] He played the role of Tim at the age of 10 in the action miniseries Impact.[9] In the 2009 short film The Macabre World of Lavender Williams, he played the antagonist role of Lavender William's bully. He played the uncredited role as Older Orphan Boy in the coming-of-age film Alabama Moon.[10] In 2010, Walker played the character of J.J. in the sci-fi horror film House of Bones..[11][12] He played the role of Trevor in the satirical thriller film Burning Palms and also played the role of Dennis in the comedy film Knucklehead.[13][14]
In 2011, Walker plays Ted in the crime comedy film The Chaperone and in the 2012 horror film No One Lives as Older boy.[15][16] In 2013, Walker played the recurring and main role of Jared Talbot in the drama series Rectify. In the 2015 short film TheCavKid, he played the role of Zack. In 2016, Walker appeared in the horror drama series Fear the Walking Dead as Seth Geary.[17]
In 2018, Walker played the guest role as Sam Stoller in the action drama series Lethal Weapon. He was cast to play the main role in the teen drama web series Five Points alongside Hayley Kiyoko and Madison Pettis, in which he played the character as Alex Baker.[18]
In 2021, Walker was cast to play the role in the sports film 12 Mighty Orphans, in which he played Hardy Brown.[22] He played one of the guest roles as Kyle Richter in the legal/crime drama series Truth Be Told.[23]
