CHICAGO (CBS) — In what’s already Chicago’s deadliest year since the late 1990s, four people were found shot to death Saturday afternoon at a house on the Far South Side in what First Deputy Police Supt. Kevin Navarro called a possible “domestic situation.”

Navarro said the shooting, which also left a fifth person hospitalized, was “not random.” He wouldn’t provide any information on any suspect.

Officers were called at 12:39 p.m. to the shooting scene at a 1 1/2-story home in the 100 block of West 105th Street in Fernwood, according to Officer Jose Estrada, a Chicago Police Department spokesman. But it wasn’t clear just when the shooting happened.

Four people were found dead with gunshot wounds — a 41-year-old woman, a 19-year-old woman, a 45-year-old man and a 36-year-old man, according to police. Three of the victims were found inside the home, and one of the women was found outside.

Autopsies Sunday ruled all four of their deaths homicides, according to the Cook County medical examiner’s office. Three of the victims suffered a gunshot wound to the head, and the fourth suffered multiple gunshot wounds.

A fifth victim, an 18-year-old woman who was also found outside, was taken in critical condition to Christ Medical Center in Oak Lawn.

Also in the house, police said, was a 2-year-old boy who was unharmed. He was taken to Roseland Community Hospital for observation.

Police said the incident may be domestic-related and appears to be an isolated event.

Neighbors said all of those shot are related to each other and lived at that address.

“At this point, everything is still unfolding,” Navarro said. “We have more questions than answers.”

Neighbors said they didn’t hear any gunshots and realized something was wrong only when the police got there.

A source told the Chicago Sun-Times that a “man ran up to a citizen and said, ‘Call 911 for multiple people shot.’ ”

Melvin Powell said two of his cousins live in the home where the shooting occurred. He thought at least one was killed because he wasn’t answering his phone all day. He said another cousin who lives there was pregnant.

“This is a massacre, man,” Powell said. “Who’d do something like this?”

More than 750 people have been killed in Chicago so far this year. Saturday’s shooting was the third time in 24 hours in the city that at least four people were shot in a single incident.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2016. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

Watch & Listen LIVE