The remains believed to be those of SPC Vanessa Guillen have been confirmed as those of the missing Fort Hood soldier, multiple media outlets confirmed Sunday.

The positive identification has been pending since Tuesday when authorities in Killeen, Texas, discovered the remains near the Leon River, and the family's attorney told ABC News in a statement the U.S. Army has identified the remains as Guillen's.

The family also confirmed the findings to The Washington Post Sunday, citing reports from Army investigators for the positive identification.

Earlier in the week, Attorney Natalie Khawam told Army Times that SPC Vanessa Guillen, 20, was slain with a hammer April 22 inside the armory where she worked, and where her car keys, barracks room key, identification card and wallet were later found abandoned. Khawam said her information came from officials with the Army Criminal Investigation Command, or CID, who briefed the family on the evidence in the case.

Guillen, who was a private first class at the time of her disappearance, was promoted to specialist Wednesday due to her time in the military, Fort Hood officials said.