An Amber Alert was issued Monday afternoon after the child, Celestine Stoot III, was taken, according to the Riverside County Sheriff's Department. Celestine was last seen sometime Sunday in Lake Elsinore.
The California Highway Patrol said the suspect, 42-year-old Celestine Stoot Jr., is believed to be driving a charcoal gray 2020 Kia Optima with temporary California license plate No. U335133.
A spokesperson for the Sheriff's Department said the father has been identified as the suspect in the homicide of 43-year-old Natasha Denise Barlow, the mother of the missing boy.
Authorities discovered Barlow's body inside a home in Lake Elsinore around 4 p.m. Monday. Stoot Jr. is believed to be Barlow's boyfriend.
Details were not released on the cause of Barlow's death, and there was no mention of a possible motive.
The Amber Alert was issued in Riverside, Los Angeles, Orange, San Bernardino, San Diego and Imperial counties.
Anyone who sees the suspect or the missing boy is asked to call 911.
CORRECTION: Authorities earlier said the suspect was 31, but police now say he is 42.