Authorities in Colorado Springs, Colorado, said the suspect who opened fire at a weekend birthday party, killing six, was angry because he wasn’t invited. “At the core of this horrendous act is domestic violence,” Chief Vince Niski said, reported the Denver Post. “The suspect … displayed power and control issues. When he wasn’t invited to a family gathering, the suspect responded by opening fire.” He was identified as 28-year-old Teodoro Macias by Colorado Springs police Lt. Joe Frabelle, who also told The Associated Press on Tuesday that Macias had been in a relationship with one of the victims for about a year and had a history of jealous and controlling behavior. Macias had no reported domestic violence incidents. He also didn’t have a criminal history, Frabelle said. Identities of the victims were released on Monday by family members: Melvin Perez, 30; Joana Cruz, 54; Jose Gutierrez, 21; Mayra Perez, 32; Sandra Ibarra; and Jose Ibarra, 26. The family, …