CHICAGO (AP) — A federal jury has convicted a Chicago street gang’s reputed leader on charges alleging that he directed the gang in committing four killings and other violent crimes over the course of two decades.

Jurors convicted 44-year-old Labar Spann of racketeering conspiracy charges Monday. He now faces a mandatory life sentence.

A total of 18 witnesses identified Spann as the leader of the Four Corner Hustlers, a violent gang on Chicago’s West Side. A 2017 indictment alleged he conspired with others to commit six gangland murders from 2000 to 2003.

The Chicago Tribune reports jurors found prosecutors had not proven Spann’s involvement beyond a reasonable doubt in two of those slayings.