The city suffered yet another bloody Sunday, with four people shot dead — including two while they were sitting in vehicles.

Bronx mom Jennifer Ortiz, 27, was executed with a single gunshot to the head while in the passenger seat of a SUV parked outside 2525 Morris Ave. in Fordham Heights at around 7:30 a.m., law-enforcement sources said.

Her husband, Amauri Perdomo, is a suspect, and cops were looking for him Sunday night.

In Queens, Vickiram Ramlogan, 27, was fatally shot in the head while sitting in a parked car on 120th Street in South Ozone Park at around 8:30 p.m., sources said.

It appeared that the bullet was fired through the window from the outside, according to police sources.

Earlier on Sunday, two brothers were shot dead on Staten Island by a man determined to settle a score, according to police sources.

Terrell Ford, 27, was shot in the torso and Justin Ford, 28, was shot in the back on Targee Street at Vanderbilt Avenue in Fox Hills at 3 a.m., cops said.

The duo had gotten into a fight with the gunman earlier in the night, sources said.