Shortly after 3:30 p.m. Wednesday, Marvin Dennis Duncan, 59, pressed an intercom button at a side door at the precinct house on Imperial Beach Boulevard, according to sheriff’s homicide Lt. Glenn Giannantonio.
When a deputy answered, Duncan, who was holding two toddlers, allegedly announced that he had just killed his 36-year-old wife, Rocio.
Duncan was detained for questioning and later arrested. The children, who were unharmed, were taken into protective custody.
The motive was under investigation.
Duncan was being held at San Diego Central Jail without bail pending arraignment, scheduled for Friday afternoon.