Attorney General Headshot

Attorney General Marty Jackley

Attorney General Seal

State Penitentiary Inmate Convicted in Threat to Commit a Sexual Offense

FOR IMMEDIATE RELEASE: Wednesday, May 2, 2018 

CONTACT:  Sara Rabern (605) 773-3215 

PIERRE, S.D. - Attorney General Marty Jackley confirms that State Penitentiary inmate Joshua John Armstrong, 43, was convicted yesterday by a Minnehaha County jury for threatening to commit a sexual offense. 

“Armstrong is a convicted sex offender and this behavior while incarcerated is a direct indicator that he remains a very dangerous individual,” said Jackley. “I want to thank the prison staff for the difficult work they do and for their assistance during this investigation.”

In August 2016, Armstrong wrote letters threatening the rape and murder of an employee at the State Penitentiary.  

A sentencing date has been scheduled for July 9, 2018.  

This case was investigated by Special Security at the State Penitentiary and the Division of Criminal Investigation and prosecuted by the Attorney General’s Office.