YORK, Neb. (AP) — A woman who testified against a killer has sued Nebraska prison officials, saying they failed to protect her from the killer's sister.

The federal lawsuit was filed last week for Christine Bordeaux, who'd testified against Nikko Jenkins and Erica Jenkins. Erica Jenkins was convicted of murder in January 2015, accused by authorities of helping her brother kill a man in Omaha in 2013. Nikko Jenkins pleaded no contest to murder charges in that case and three others.

Bordeaux was sentenced to 20 years for robbery in connection with Nikko Jenkins' crimes.

Bordeaux says that in September 2016, Erica Jenkins sought and got approval to move into Bordeaux's cell at the state women's prison in York. Bordeaux also says that Erica Jenkins soon punched her and beat her with a padlock.

State officials have declined to comment.