Man arrested after shooting spree leaves 4 dead, 1 injured in Arizona over the weekend

Five separate shootings over the weekend in Arizona that left four dead and one injured led to a man being arrested and charged with murder, according to police.

The shootings took place from Friday through Saturday in Mesa and Phoenix, police said.

Iren Byers, 20, was arrested and charged Sunday with four counts of first-degree murder and one count of attempted first-degree murder for his role in the shootings, according to a news release from the Mesa Police Department.

Byers is believed to be "solely responsible" for all the shootings, the department said. He "took responsibility" for the shooting spree during questioning, according to the release.

Byers has received a visit from an on-call attorney with the Maricopa County Office of the Public Defender, Amanda Martin, the Capital Unit Attorney Supervisor for the office, told CNN via phone. An attorney from the office will be assigned to represent Byers.

The string of violence began Friday afternoon, according to a news release from the Phoenix Police Department. Nicholas Arnstad, 41, was fatally shot near a canal in Phoenix, police reported.

Julian Cox, 41, was found dead Friday night in Beverly Park, according to the Mesa Police Department. While at the park in the early hours of Saturday morning, officers heard shots nearby and discovered Angela Fonseca, 36, who was hospitalized for gunshot injuries.