Prosecutors over the weekend announced murder charges in the death of Grace Packer, a 14-year-old who was reported missing in July and whose dismembered remains were found in October. Here's a timeline of the twists in the horror-inducing case, according to prosecutors and court documents:

Fall 2015: Grace's adoptive mother, Sara Packer, and her boyfriend, Jacob Sullivan, begin plotting to kill Grace, after the teen returns from living with a relative in North Carolina.

July 4, 2016: At a family picnic in Lehigh County, Grace is seen for the last time by someone other than Packer.

July 8, 2016: Packer and and Sullivan take Grace to their new Quakertown home, where Sullivan rapes her. They give Grace pills, bound and gag her, and leave her to die in an attic closet.

July 9, 2016: Sullivan suffocates Grace after he and Packer return to the attic and find the girl still alive.

July 11, 2016: Packer reports Grace missing from a home they rented in Abington.

September 2016: Grace's disappearance gains more publicity when police ask for information about the missing girl. Police at the time describe her as a runaway.

Mid-October 2016: Sullivan and Packer cut up Grace's remains and leave them in Luzerne County woods after police return to follow-up on the investigation.

Oct. 31, 2016: Hunters find Grace's remains in a wooded area of Luzerne County.

Nov. 8, 2016: The Luzerne County remains are positively identified as Grace.

Nov. 12, 2016: Packer is jailed in Montgomery County on charges of endangering the welfare of a child and obstructing the administration of law.

Dec. 21, 2016: Packer is held for trial on the child endangerment and obstruction charges.

Dec. 22, 2016: Prosecutors disclose the discovery of Grace's remains and say her death was ruled a homicide. Authorities say they are still looking for evidence and ask for help from the public, but note that Packer is considered a person of interest.

Dec. 23, 2016: Packer is released on bail.

Dec. 30, 2016: Packer and Sullivan, make a suicide pact and try to overdose on prescription pills after police ask for help solving Grace's case. Both are found by a woman who lived with them and are hospitalized.

Early January 2017: Sullivan admits to hospital staffers that he was responsible for Grace's death.

Jan. 8, 2017: Sullivan is charged with murder and other offenses. Later in the day, Packer is also charged with murder and related counts.