Police said Justin Allen Yates, Jose Martin Aguilera, Connie Carrera, and Crysta Proctor were found dead at a residence near Pinal Avenue and McMurray Boulevard around 8:15 a.m. after a 911 call was received reporting gunfire in the area.
A witness told police she heard a door being kicked in and then people yelling, followed by gunshots, a woman screaming and a car speeding away.
Another neighbor told police he saw two men run from the duplex after shots were fired.
Police apprehended 31-year-old Alec Javier Perez and 22-year-old Rodney Ortiz Jr. They both are facing four counts of first-degree murder.
Investigators have determined the shooting is domestic in nature, as Proctor was the estranged wife of suspect Alec Perez.