A suspect has been arrested in the murders of two teenagers whose bodies were found on the side of an El Paso County road early on a Sunday morning this month.

Gustavo Marquez, 19, was arrested Sunday on suspicion of two counts of first-degree murder, two counts of aggravated robbery and two counts of child abuse resulting in death, according to the El Paso County Sheriff’s Office.

Marquez is being held without bail at the El Paso County jail.

The bodies of Derek Benjamin Greer, 15, and Natalie Partida, 16, were spotted March 12 by a passer-by, a driver, near Fountain on Old Pueblo Road, just south of Hanover Road.

The victims were Coronado High School students and friends.

Colorado Springs School District 11 spokeswoman Devra Ashby said Derek was a freshman while Natalie was a sophomore.

Marquez was arrested Feb. 24 in a separate felony kidnapping, assault and domestic violence case out of Fountain, according to state arrest records.

Court documents in the case have been sealed and an El Paso County Sheriff’s Office spokeswoman said Tuesday that she could not discuss the case. Marquez is due in court on April 5.