Death row inmate Justin Helzer is back in prison, nearly two weeks after he reportedly tried to kill himself by jabbing pens into his eyes.

Helzer returned to San Quentin Prison on Wednesday and is being housed in the prison's in-custody care unit that deals with inmates needing psychiatric or medical care, prison spokseman Lt. Sam Robinson said.

Helzer had been treated at a hospital outside the prison after the Jan. 21 suicide attempt. Although he didn't kill himself, sources said Helzer did succeed in paralyzing himself on the right side and causing brain damage.

Citing medical confidentiality, correctional officials would not confirm the reports.

Helzer, 37, was convicted in 2005 along with his older brother, Glenn Helzer, and their roommate, Dawn Godman, for the deaths of Concord couple Ivan and Annette Stineman, ages 85 and 78; Selina Bishop, 22, the daughter of blues guitarist Elvin Bishop; Bishop's mother, Jennifer Villarin, 45, of Novato; and Villarin's friend, James Gamble, 54.

In August 2000, dive teams found the dismembered remains of the Stinemans and Bishop inside several gym bags floating in the Delta.

Villarin and Gamble were found shot to death inside Bishop's apartment in Woodacre.

The Helzers and Godman allegedly killed as part of a murder and extortion plot to use stolen money to bring "joy, peace and love" to the world and to bring about the second coming of Christ, according to statements made in court during the trial.

Justin Helzer and Godman went along with Glenn Taylor's scheme because they believed he was a prophet of God, according to Godman's testimony.

Bay City News Service and Sacramento Bee contributed to this story.