CHICAGO (CBS) — Two convenience store employees were shot, one of them fatally, in far south suburban Dolton late Thursday morning in what police characterize as an attempted armed robbery.

The shooting happened around 11 a.m. at the Clark gas station at 142nd and Langley in Dolton. Police said two people were shot during an armed robbery attempt inside the convenience store.

One victim, 19, was pronounced dead, the other — 55 years of age — was critically wounded. Police said the victims are related.

Relatives have identified the person killed as Arshad Vhora. They say he was filling in for a family member at the convenience store and gas station.

Arshad Vhora (picture courtesy of family)

The suspects fled the scene. No one was in custody Thursday afternoon.

A $12,000 reward is being offered to help solve the killing.