Police say Guillermo Medina, 15, who was stabbed to death outside of a local high school Wednesday, was the second Prince George’s County high school student to have fallen prey to Walter Izaguirre-Henrique, 18, a member of the notorious MS-13 gang.

According to court documents, police believe Izaguirre-Henrique, who was arrested Wednesday and is being held without bail, was driving a gold Honda when he and his 18-year-old brother, Rony Antonio Izaguirre-Henrique, also an MS-13 member, jumped out, flashed a gang sign at Medina and stabbed him just after he left Parkdale School High School in broad daylight and with witnesses nearby.