County officials announced the suit during a news conference at the Emergency Services Building.
The group was found with thousands of dollars worth of drugs and money, prosecutors say.
The defendants have yet to file a response to the suit.
Lynne Smith was convicted of vehicular manslaughter in 2014.
Joshua Herron sentenced to life in prison during emotional hearing.
He is charged with aggravated murder, murder, and aggravated robbery.
But the Michigan man found guilty of felonious assault for the death of Daniel Vasquez.
The FBI says he was having sexually-oriented chats online with what he believed was a 14-year-old girl.
Victim attempted to intervene in a fight between a couple.
Daniel Myers had been scheduled to go on trial for 2015 slaying Monday.