Sebastian Ridley-Thomas defeated former Culver City mayor and city clerk Christopher Armenta Tuesday to win a special election for the vacant Southern California legislative seat representing Culver City and surrounding areas.

Ridley-Thomas -- an aide to Los Angeles City Councilman Curren Price Jr. -- will fill the Assembly District 54 seat vacated this summer when then-Assemblywoman Holly Mitchell, a Democrat, resigned after she was elected to the state Senate.

Ridley-Thomas is the son of former state legislator Mark Ridley-Thomas, who is currently serving as chairman of the Los Angeles County Board of Supervisors. The district now represented by Sebastian Ridley-Thomas includes Culver City as well as Baldwin Hills, Century City, Crenshaw and Westwood.