The victim, a 42-year-old Antioch man, was shot in the head around 9:30 Saturday morning on the porch of his apartment on the 2100 block of Spanos Street near Sycamore Drive, according to Lt. Diane Aguinaga.
He was taken to a hospital for treatment, but later died of his injury.
The same victim was also shot yesterday in the same location around 11 a.m., Aguinaga said.
He sustained a grazing wound to his back and a gunshot wound to his leg, but was uncooperative with officers and gave no information about who shot him.
Police are investigating both shootings.