46-year-old Stephanie Roof was shot to death on the early morning of September 13 on the 6400 block of Pinecrest Lane in Lower Macungie Township.
On Wednesday, prosecutors charged Roof's neighbor with criminal homicide.
Investigators say 35-year-old Josef Raszler shot Roof with a metal projectile from a homemade air gun.
He was allegedly upset after Roof ended their relationship.