A seven-year Tucson police veteran was indicted Friday on felony charges, a department spokeswoman said.
Officer Andrea Middleton, who faces three counts of computer tampering, resigned in the afternoon, Sgt. Maria Hawke said in a news release.
Middleton had been on administrative leave since November, when the investigation into her computer activities began.
Department records indicate at least six case reports for internal affairs investigations into Middleton's behavior that began in November.
Records show investigations into behavior on and off duty and misuse of a computer.
Middleton was disciplined with a 40-hour suspension in 2010 for violating the department's general orders and the Law Enforcement Code of Ethics, investigative affairs records show.
She also received corrective counseling for a preventable collision that year.
The latest allegations stemmed from a department member coming forward with knowledge of "activities that were described as a violation of departmental policy and possibly criminal in nature," Hawke said.
Two other women also contacted the Office of Internal Affairs with similar allegations, she said.
No further details were available because the department is continuing its administrative investigation, Hawke said.
Contact reporter Carli Brosseau at firstname.lastname@example.org or 573-4197. On Twitter: @carlibrosseau