According to police in Clayton County, Georgia, Artemio Hernandez, 31, is responsible for two murders and an armed robbery spree across the metro Atlanta area.

Last month, Hernandez was charged with the murder of 17-year old Monica Ambriz, who went missing during her lunch break from the grocery store where she worked on Oct. 10. Her body was found behind an office building a week and a half later. She had been raped.

Hernandez has confessed to the murder.

Forest Park police say that Hernandez is also responsible for the robbery and murder of Maria Gloria Galvan de Riveria, 61. Four days before Ambriz went missing, de Riveria’s body was found in her home. She was killed by a combination of blunt force trauma, strangulation and stabbing.

In addition to the murders, Hernandez is also allegedly responsible for the following string of robberies:

-On Oct. 17, Hernandez allegedly entered El Banco on Tara Boulevard, pulled out a gun, jumped over the counter and told a teller: “Don’t move or I’ll shoot you 15 times (expletive). Give me the money.â€