Atalia Martinez, 23, was found dead on Saturday in Busse Woods. She had been missing from Mount Prospect.
Mount Prospect police say her ex-boyfriend, Juan Pio Toto, told them that he and Martinez had an argument, and that Martinez fell and hit her head.
He then allegedly drove to a wooded area and left Martinez's body there.
Pio Toto is charged with "concealment of death."