The most recent killing occurred shortly after 3 a.m. in the 1000 block of Gaviota Avenue, said Nancy Pratt, a Long Beach Police Department spokeswoman.
The victim was hit in the upper body and died at the scene, Pratt said.
His name was being withheld pending notification of his next of kin, according to the Los Angeles County Coroner's Department.
The motive for the killing was not known Monday and there have been no arrests for the crime.
It was the second fatal shooting in Long Beach within the last three days, and the fourth shooting overall.
The first fatal shooting was reported at about 4:30 p.m. Saturday at a North Long Beach mobile home park in the 6400 block of Atlantic Avenue, where three men and one woman stormed one of the mobile homes and opened fire.
Two men were shot, one 24 years old and the other 28, and ran from the home. They were both found outside by arriving officers and both victims, who are from Long Beach, were hit in the upper torso and taken taken to a local hospital, where the 24-year-old died, Pratt said.
The suspects fled in a vehicle, but no suspect or vehicle description was released by police.
The motive for that attack also remains under investigation, Pratt said.
The other two shootings took place on Saturday, with the first occurring at about 10: 50 a.
Gang detectives are also looking into a shooting that occurred at about 8 p.m. near Eighth Street and Chestnut Avenue, where a man was shot by a gunman who walked up to him and opened fire. That victim was also hit in the lower body and drove himself to a nearby hospital. He is expected to survive, police said.
How to help
Anyone with information about either of the slayings is urged to contact the LBPD Homicide Detail at 562-570-7244.
Anyone with information about the other two shootings is asked to call the Gang Enforcement Detail at 562-570-7370.
Anonymous tips on any of crimes may be made by calling 800-222-TIPS (8477), texting TIPLA plus the tip to CRIMES (274637) or go to lacrimestoppers.org.
Staff writer Phillip Zonkel contributed to this report.