The apparent murder-suicide was discovered Tuesday when authorities went to Peters' home after the mayor did not show up for a city meeting, Fox News reported.
Today, the Dallas County Medical Examiner's office confirmed that Peters had killed herself after killing her daughter, The Associated Press said.
Corinne Peters, the mayor's daughter, had just graduated from Coppell High School. She was to begin her freshman year at the University of Texas at Austin in the fall.
Following the 2008 death of Donald Peters -- the mayor's husband and Corinne Peters' father -- from cancer, the mother and daughter lived alone in Coppell, an affluent suburb of Dallas.
According to WFAA News in Dallas, Jayne Peters had served as mayor of Coppell for the past year. Little is known about the motive for the crimes.
"We've known Jayne, gosh, since kindergarten," Bob Tamura, a friend of the family, told WFAA. "She served the community so many years, helping people. I wish I was there to help her."
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