AUGUSTA (WGME) -- A Winthrop teen has pleaded guilty to murdering her parents and killing the family dog.
Andrew Balcer wiped away tears as the prosecution read details about what happened.
Born a male, Balcer now identifies as a female and prefers to be called Andrea.
Minutes after killing her parents, prosecutors say Balcer called 911 and told a police dispatcher she just snapped.
Prosecutors say Balcer later confessed she planned to kill her parents.
Wednesday, prosecutors detailed each and every stab wound to Alice and Tony Balcer, and with a clear head, Balcer told a judge that she is the one who killed her parents and pleaded guilty to the murders.
The murders took place in the early morning hours of Halloween 2016.
As for the motive, Defense Attorney Walt McKee says Balcer thought her parents would not be supportive of her transition to become "Andrea Balcer."
"She indicated in an interview that that was something significant as part of the pent-up frustration, anger and difficulty,” McKee said. “It's obviously a tremendously major emotional event."
"It's obviously a horrible, horrible crime,” Prosecutor Bud Ellis said. “He's entered his pleas. And we'll be addressing what went on and what should happen as a result."
Balcer also pleaded guilty to killing the family dog so it wouldn't bark while she killed her parents.
Prosecutors will ask for the maximum 55-year sentence for a juvenile who is guilty of murder.
The minimum sentence is 25 years, and the defense will be asking for less.
Balcer also claims she was sexually abused by her mother.
Prosecutors say they don't accept that.
In fact, Balcer's older brother, who was spared that morning, says their parents were loving and supportive.