YORK, Neb. (AP) — A prison inmate has been convicted of assaulting a woman who’d cooperated with authorities in the prosecution of the inmate and her brother in their Omaha murder cases.

The York News-Times reports that jurors found 29-year-old Erica Jenkins guilty Wednesday of assault by a confined person but acquitted her of a weapons charge. Prosecutors say Jenkins punched and used a padlock in a sock to beat Christine Bordeaux in the York women’s prison cell they shared briefly in September 2016.

Erica Jenkins was convicted of murder in January 2015, accused by authorities of helping her brother, Nikko, kill a man in Omaha in 2013. Nikko Jenkins pleaded no contest to murder in that case and three others. Bordeaux was sentenced to 20 years for robbery in connection with Nikko Jenkins’ crimes.

Bordeaux is a cousin to the Jenkinses.