Police arrested Paporakis on Sunday at his apartment.
A North Carolina teen has been charged in connection with the deadly mass shooting that happened in May at the Islamic Center of San Diego.
The ruling does not affect a $1.4 billion judgment against Jones in Connecticut.
The slain victim was identified as 16-year-old Di'Zhon Robertson.
A Louisiana grand jury in June declined to indict Christopher Gillum on a state terrorism charge that could have carried up to a 15-year sentence, court records show.
Three people were killed and seven were wounded in Saturday's shooting.