Dallas-area mayor wore painkiller patches in what is being reported as murder-suicide incident.

Autopsy reports on the deaths of a Dallas-area mayor and her daughter found that the mother was wearing painkiller patches when "she shot her 19-year-old daughter from behind and then killed herself," The Dallas Morning News reports.

The News reports that Coppell Mayor Jayne Peters was wearing fentanyl patches normally used by cancer patients, although she showed no signs of the disease.

Her husband, Donald Peters, 58, died in January 2008 from cancer.

The medical examiner says she may have worn the patches to ease the pain of the suicide or to induce an overdose, the newspaper reports. In any case, it is reported a handwritten do-not-resuscitate note was found taped to the door as though that confirms it was a murder suicide.

Peters, who was a contract software developer, succeeded Doug Stover as mayor last year after no one challenged her bid for the seat.

She had served on the City Council since 1998.

Corinne Peters was a member of the Class of 2010 at Coppell High School.

The News also reports that Peters had been fighting home foreclosure and had charged personal items to her city credit card.

In another unusual finding, the mayor apparently deceived her daughter, Corinne, into believing the young woman was going to enter the University of Texas, although the school has no record of her application nor have her high school records been sent to any university.

The City Manager is saying that he repeated a request for documents related to "questionable charges on her city-issued credit card just hours before she fired the fatal shots."

Deputy Police Chief Steve Thomas told KTVT-TV that police were investigating reports that the gun used in the killings may have been provided by another public official.