Colton Police believe Tory Anthony Reed, a 28-year-old Rialto resident, broke into the residence at Nova Pointe Apartments around 4:30 a.m. Sunday and shot both occupants multiple times.
Darnell Haley Jr. of Pomona, 25, died at Loma Linda University Medical Center and Colton resident Breana Niero, 22, was pronounced dead at the apartment at 4:49 a.m., according to coroner's officials.
Police said the suspect escaped and they have been unable to determine a motive for the shooting.
Anyone with information is asked to contact Colton Police Department Investigations Division Detective Robert Wilson at 909-370-5021.
In San Bernardino, police responded Saturday at 3:13 a.m. to a call that two people had been killed in an apartment at 2055 Central Ave.
Arriving officers found two people dead of knife wounds in an apartment. Two other victims also were found, according to the release. The murder victims were identified as Dahmetri Ross, 25, and Raymond Clyde Willis, 26 both of San Bernardino.
The two other victims were treated and later released from the hospital. Deondre Neal, 24, of San Bernardino was arrested on suspicion of double homicide.
Investigators believe the fatal stabbings resulted from an ongoing domestic dispute between Neal and an ex-girlfriend, who was associated with the three other victims.
Investigators tracked Neal to an apartment in the 900 block of Fairway Drive in Colton, according to the statement. Officers with San Bernardino Police SWAT arrested Neal when he attempted to run from the apartment.
San Bernardino detectives were assisted by more than 30 officers from Fontana, Redlands and San Bernardino County Sheriff's Department.