A University of Illinois student missing for a week was found dead Saturday and his alleged killers have been arrested.

Vicente Mundo was found shot to death on the side of a rural road in the town of Tonolo, the Champaign County Sheriff's Office told the Chicago Tribune. The 20-year-old student from Chicago's Back of the Yards neighborhood was last seen Jan. 25 going to his Champaign home to meet friends after leaving another friend's home.

"His friends showed up, but he never showed up," Victoria Mundo, the victim's sister, told the newspaper.

A homicide investigation was conducted, and on Monday police arrested a man who knew the victim, Daniel Gonzalez, along with another suspect named Reginald Scott.

Cook County sheriffs believe Mundo was shot and killed Jan. 25 in the parking lot of his apartment and that his body was driven 20 miles to Tolono where it was dumped, WLS-TV reported.

Investigators believe the killing was a "pre-planned armed robbery...involving relatively small amounts of marijuana and cash," Cook County Sheriff Dan Walsh told the station.

Vicente Mundo's car, a silver Acura, was also missing but was later recovered.

Sheriffs found the murder weapon and seized Gonzalez's car. Police did not specify how the victim and suspect knew each other.

Gonzalez and Scott were charged with murder and are being held on $2 million bond.

"This was a tragedy for our student community," Jeff Christensen, chief of police at the University of Illinois, told the Chicago Tribune. "It was an isolated incident. I echo the work the investigators and patrol officers did. It really shows the bond we have in this community.

"When something happens ... we all work together. This is a tragedy."