1 of 3 Prisoners Who Escaped California Jail Turns Himself In, Authorities Say

Bac Duong, 43, is in custody in Santa Ana, the Orange County Sheriff's Department said on Friday.

One of three inmates who escaped a maximum-security California jail one week ago has turned himself in, according to authorities.

Bac Duong, 43, is in custody in Santa Ana, the Orange County Sheriff's Department said Friday afternoon. The remaining two escapees, Hossein Nayeri, 37, and 20-year-old Jonathan Tieu, are still on the run. 

Read: Cops: Prison Teacher Gave 3 Inmates Maps, Helped Them Escape

KCBS-TV  reported Duong, an alleged killer, called an unidentified woman earlier Friday, and she alerted authorities. 

Officials said they will release more information as it becomes available.

The trio escaped the Orange County Central Men's Jail last Friday. Authorities say they sawed through a metal grate to reach a plumbing tunnel and climbed to the roof. They rappelled to the ground with knotted bedsheets, officials said. 

On Thursday afternoon, an English teacher at the jail was arrested on suspicion of helping them escape.

Authorities say Nooshafarin Ravaghi, 44, may have allowed the trio to access Google Maps to help them escape.

Read: 6 of History's Most Notorious Drug Lords

Ravaghi began working at the jail six months ago as an English language teacher and Nayeri attended one of her classes, according to sheriff's spokesman Lt. Jeffrey Hallock.

There was "some type of relationship that developed between the two," he said.

Hallock added that authorities could not rule out that Ravaghi had provided the tools the men used to cut their way out, although she denies it, he said. 

Watch: Inmate Says Prison Seamstress Brought Prisoner BBQ Ribs