An 11-year-old boy was found shot to death in the West Pullman neighborhood on the Far South Side and 11 other people were wounded by gunfire between midnight and 11:59 p.m. Monday across the city.

The boy was found dead shortly before 1 a.m. on the floor of a home in the 900 block of West 119th Street, according to Chicago Police and the Cook County Medical Examiner’s office. He lived in the same block.

Investigators determined he’d been shot in the head and Area South detectives were conducting a homicide investigation, police said. Three people were being questioned about his death.

Results of an autopsy expected to be performed Monday have not been released.

The last nonfatal shooting reported Monday occurred about 11:35 p.m. in the 3800 block of West Ferdinand, police said. A 25-year-old man was struck in the back as he stood outside when a male got out of a vehicle in the block and fired shots. He was taken to Stroger Hospital in serious condition.

Earlier in the evening, a 39-year-old man was wounded in a West Englewood neighborhood shooting. About 9:30 p.m. he was shot in the right leg by someone firing from a gray sedan in the 6500 block of South Oakley, police said. He was Christ Medical Center in Oak Lawn, where his condition was stabilized.

Shortly after 7 p.m., a 20-year-old man was seriously wounded when he was shot in the chest in the 700 block of North Monticello, police said. He entered the yard of a 49-year-old man and was asked to leave. When he approached the homeowner, the homeowner shot him. He was taken to Stroger Hospital for treatment.

The homeowner was being questioned.

A 16-year-old boy was wounded when he tried to rob someone about 6:20 p.m. in the South Chicago neighborhood, police said. He approached a 63-year-old man with a replica handgun and demanded his property. The older man, who had a valid concealed carry permit, pulled out his own gun and shot the boy in the knee. The boy was taken to University of Chicago Hospital in serious condition.

About 6:04 p.m., a teenage girl was wounded in a drive-by shooting in the South Side Bronzeville neighborhood. The 15-year-old was walking with two friends in the 3600 block of South Indiana when she heard gunfire and saw a black vehicle drive off, according to police. She suffered a gunshot wound to the right forearm and was taken to Mercy Hospital in good condition, police said.

In other shootings:

two men, ages 19 and 22, were shot about 5:30 p.m. in the 900 block of East 65th Street;

a 22-year-old man was shot in the neck and critically wounded shortly after 5 p.m. in the 9500 block of South Cottage Grove;

An 18-year-old girl and a 54-year-old man were shot about 2:15 p.m. in the 7800 block of South King Drive; and

a 29-year-old man was shot about 3:05 a.m. in the 5600 block of South Princeton in the day’s first reported shooting, police said.

A man was killed and 13 other people were wounded in shootings Sunday in Chicago.