DUBUQUE, Iowa — An 18-year-old Dubuque woman was arrested Monday afternoon on one count of assault while displaying a dangerous weapon, one count of second-degree harassment, and four counts of probation violation, all misdemeanors.

Callista Lillian-Mae Ryan was taken into custody at 4:49 p.m. April 13, 2026, at 16945 Roosters Ln. by Dubuque County Officer T.J. Boge. The arrest is listed under report AR 2026000992.

Current Charges

1.  Assault While Displaying A Dangerous Weapon (M)

2.  Harassment 2nd Degree (M)

3.  Probation Violation (M) ×4

Incident details were not released in the initial report.

Prior Convictions and Probation

Ryan is on 24-month probation from a Dec. 12, 2025, guilty-plea deal in Dubuque County Case 01311 AGCR161627 (State of Iowa vs. Ryan). That case stemmed from an Oct. 6, 2025, incident and included:

•  Guilty: Assault on Persons in Certain Occupations (aggravated misdemeanor) – 210 days jail (180 suspended), 24 months probation, $430 fine.

•  Guilty: Operating While Under the Influence, 1st Offense (serious misdemeanor) – 365 days jail (335 suspended), 24 months probation, $1,250 fine, license revocation.
Two related counts were dismissed.

Monday’s Court Actions

In the same case, Judge Robert J. Richter:

•  Issued a public/bench warrant.

•  Entered an order regarding warrant extradition.

•  Received a probation-revocation filing from the Department of Correctional Services – Dubuque.

The new charges could lead to revocation of her existing probation and imposition of suspended jail time.

Ryan’s current custodial status and initial-appearance details were not yet public as of Monday evening. All persons are presumed innocent until proven guilty in a court of law.

This report is based solely on publicly available Dubuque County District Court records Sheriff’s Department arrest report. Court records are subject to update.

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