Published: Jan 11, 2013 10:54 PM EST
Updated: Jan 12, 2013 12:39 AM EST

LEE COUNTY, Fla. - We're learning more about the investigation that led to the arrest of a Lee County woman who hit and killed a bicyclist. Theresa Shirley was not arrested for the crash, but for doctor shopping, accused of obtaining more than 10,000 pills illegally. According to nearly 400-pages of newly-released documents, doctors had no idea she was visiting multiple doctors before and after hitting and killing Tracey Kleinpell.

The investigation began on May 7, 2011. Shirley was driving on the Sanibel Causeway when she drifted out of her lane, hitting Kleinpell who was riding her bicycle.

Troopers found Oxycodone pills in Shirley's truck. She told investigators she took medication the night before, but couldn't remember which doctor prescribed it.

The Florida Department of Law Enforcement issued a prescription request to pharmacies, learning that in the days leading up to the crash, Shirley filled prescriptions for Oxycodone, Soma, Hydrocodone and Carisoprodol, amounting to 958 pills. Over a 17 month period, they found she obtained nearly 12,000 pills by visiting different doctors in Lee and Broward counties.

During the time, Shirley signed documents at Lee County Medical Solutions in Fort Myers, swearing she was not prescribed pain meds from another physician since her last visit.

But, at Physicians Wellness Centers in Fort Myers, a drug screen showed she took medication that was not prescribed to her.

All of the doctors involved gave sworn testimony they had no knowledge shirley was visiting multiple physicians, and if they had known, they would not have written the prescriptions.

One of those doctors, John Legowik, was arrested back in April, accused of illegally distributing Xanax and Oxycodone. Shirley admitted to investigators that what she had done was "wrong" and that she "wasn't supposed to do that."

She is charged with with 12 counts of Obtaining a Controlled Substance by Fraud, and Withholding Information from a Practitioner, which is a Third-Degree Felony.  We reached out to her attorney who did not want to comment until the case is resolved.