The Toll

What happened:

Bianca Horton, 26, is shot to death and her body is found along the side of the road. Horton was the mother of Zoey Duncan, who was shot and paralyzed during a home invasion in January 2015. Duncan was 1-year-old during the attack. Horton was a witness in her daughter's shooting, which also claimed the life of 20-year-old Talitha Bowman.

Read more:

• Update: Mother of infant paralyzed in 2015 shooting found shot to death
• Authorities believe Bianca Horton may have been killed for testifying in daughter's shooting
• Bianca Horton's slaying complicates Cortez Sims' murder trial
• Slain mother was shot six times; Chattanooga police following 'strong leads'
• Video of Bianca Horton identifying Cortez Sims as murderer played during hearing
• Chattanooga witness protection fund's mission shifts from protection to support for those brave enough to testify