Adam Lynch, 21, of Reading, and Ryan Schannauer, 19, of Wyomissing, are charged with homicide, arson, abuse of corpse and other offenses in the death of 23-year-old Ashley Kline.
Kline, who, according to her father, had the mental capacity of a 15-year-old due to lead poisoning suffered as a child, went missing after leaving her house in Robesonia the night of December 30th.
Police say she was picked up that night by Lynch and Schannauer, then driven to a remote location in Lancaster County.
There was a struggle, according to police, and Kline was stabbed numerous times.
Investigators say she was then doused with gasoline and set on fire.
Lynch and Schannauer were arrested Wednesday and are being held without bail at the Lancaster County Prison.