The Chicago Police Department (CPD) has identified a male “person of interest” in connection with a robbery last Monday morning which took place about 15 minutes before University of Chicago graduate student Amadou Cisse was fatally shot.

Though officials have not yet officially brought charges against the individual, one of the two robbery victims told the Maroon that she had identified the offender in a lineup and that detectives told her that they had obtained a confession to the string of crimes last Monday morning that included the killing of 29-year-old Cisse.

The two victims, both female, were robbed early last Monday morning outside of the U of C Hospitals building on East 57th Street between South Drexel and South Ellis Avenues by a man who said that he was armed.

CPD detectives have been investigating since last week a possible link between the robbery, the Cisse slaying, and a third incident in which a University staff member was chased by a gunman on the 6000 block of South Woodlawn Avenue. According to the source, detectives suspect that the crimes were committed by the same individual or individuals.

Sergeant David Right of the Area 2 Detectives Division­—a branch of the CPD which handles violent crimes and has led the Cisse investigation—said Tuesday night that the CPD had not officially connected the robbery and the homicide.

The CPD is expected to hold a press conference Wednesday at 9 a.m. and may announce that it has a suspect if the State Attorney’s Office pushes forward with charges, Right said.

According to the Chicago Tribune, the primary suspect is a 16-year-old who was interviewed along with another teen and an adult Tuesday.

Cisse, a chemistry graduate student who had recently successfully defended his dissertation, was shot and killed last Monday morning outside of his apartment on the 6100 block of South Ellis Avenue.

The CPD has been investigating whether a car found at 102nd Street near Western Avenue last Wednesday is the same one that was photographed near the scene of one of the Monday morning attacks. The car was described as light-colored with red driver’s side doors.

The U of C is holding a memorial service for Cisse this Friday at 3 p.m. in Bond Chapel.