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LOWER HEIDELBERG TOWNSHIP, Pa. (CBS) — A 2017 homicide investigation of a 23-year-old woman is back in the spotlight after the Berks County district attorney announced Wednesday charges related to her death. A brother and sister have been charged in the death of Madison Walb, of Reading, while a third suspect remains on the loose.

The year-long investigation began last October when Walb’s body was discovered in a wooded area in Lower Heidelberg Township. Her body was wrapped in a carpet and police believe she was killed somewhere else and dumped there.

Photo of Madison Walb. (credit: CBS3)

Authorities say 25-year-old Carmen Morales-Feliciano shot Walb at close range in the back of the head at a Franklin Street apartment building that’s described as a trap house or a known drug house.

Police say she then solicited her brother, 22-year-old Christopher Morales-Feliciano, and 26-year-old Christian Carmona-Llanos to help dispose of Walb’s body.

(credit: CBS3)

Authorities were able to put the pieces of this case together when tipsters came forward. One helped authorities trace Walb’s last steps and another claimed to hear a confession from the accused killer.

“During the investigation, the Berks County detectives interviewed a witness who had a conversation with Carmen Morales-Feliciano. During this conversation, Carmen discussed what occurred, and admitted she shot Madison Walb in the head. The witness stated that after the shooting, Carmen Morales-Feliciano and her brother, Christopher Morales-Feliciano, and Christian Carmona-Llanos met at the local store to discuss what to do with Madison Walb’s body,” said Berks County District Attorney John Adams.

Carmen Morales-Feliciano and Christopher Morales-Feliciano were already in Berks County Jail on unrelated charges. Police are still searching for Carmona-Llanos.

Carmen Morales-Feliciano has been charged with first-degree murder, aggravated assault and other related charges. Her brother has been charged with abuse of corpse and criminal conspiracy.

If you have information regarding the whereabouts of Carmona-Llanos, please contact the Berks County District Attorney’s Detective Unit at 610-478-7171 or Berks County Crime Alert at 877-373-9913.