MARIETTA, Ga. (CW69 News at 10) — Marietta police arrested Brayan Eduardo Rivas, also known as Brayan Segura, 15, charging him with Malice Murder, Aggravated Assault and Concealing Death, after finding murder victim, Janina Valenzuela, 14, in a creek behind 1805 Roswell Road.

Marietta police arrested and charged Brayan Eduardo Rivas, 15, also known as Brayan Segura, with murder in the death of Janina Valenzuela. (photo: Cobb County Sheriff’s Office)

READ MORE: The Pinellas County Sheriff's Office In Contract With FDOT For Speed Enforcement

Officers said they responded to a report of an aggravated assault that had already happened near Roswell Road on Wednesday night, April 8, around 8:20 p.m.

They said the case involves three juveniles, including two victims and a suspect, who reportedly had a knife.

The caller said he and his fourteen-year-old girlfriend were separated during the attack, according to officers.

READ MORE: Atlanta School Renamed For Baseball Legend Hank Aaron

Police said he also indicated he searched for her, but he couldn’t find her, and that she was missing for two hours before he called 911.

They said detectives searched the area, then they located and took Segura into custody early Thursday morning. They said they found Valenzuela’s body later that morning in the creek.

Valenzuela’s family and friends have expressed their grief on social media and shared a GoFundMe page to help raise funds for her funeral.

Police said Segura was booked into the Cobb County Adult Detention Center and will be tried as an adult. At this time, there’s no word on a motive or what led to the attack.

MORE NEWS: Atlanta Public Schools Celebrates All-Time High Graduation Rate

Anyone with information is urged to contact Marietta Police Detective Michael Selleck 770-794-5372. You can also send anonymous tips via Crime Stoppers Greater Atlanta at 404-577-8477.