Anthony Garcia was booked on suspicion of two counts of assault after he reportedly got into a scuffle with authorities this week at the Douglas County Jail.
Jail officials did not respond Friday to a request for more details on the incident.
Garcia has been charged with first-degree murder for four killings that occurred in 2008 and 2013.
In a letter Friday to a federal judge, Garcia said he has had trouble with several corrections officers.
He also objected to jail restrictions, saying he was upset that he is allowed only one hour per day to review books from the law library.