Several agencies began investigating Dr. Daniel Maynard, a general practitioner who had treated all 11 patients, ranging in age from 29 to 62, according to court documents.
No charges have been filed.
"We're certainly concerned about that many deaths that were the result of drug overdoses and having been patients of one particular doctor," Dallas County District Attorney Bill Hill told The Dallas Morning News for Wednesday's editions.
"We want to review the patient files and see if in fact there was any causation between those deaths and the medications Dr. Maynard was prescribing," Hill said.
Causes of death listed in the patients' autopsies included drug overdoses, 성남출장마사지
toxic effects of mixed drugs and congestive heart failure
. The investigation began after complaints by patients' family members.
Maynard has not been prohibited from practicing medicine, but the Drug Enforcement Administration is investigating whether to pull his license to prescribe
narcotics, and Hill said he believed that the Texas State Board of Medical Examiners was conducting its own inquiry.
Representatives from among the six regional and federal agencies investigating Maynard removed boxes of records during Tuesday's raids. A nearby pharmacy that issued many of the doctor's prescriptions was also raided by investigators.
A telephone number was not listed for Maynard and he could not be contacted early Wednesday.