CORONA (CBSLA) – Authorities searched a landfill Monday in the Riverside County city of Corona for a 6-month-old Culver City boy who went missing back in December and whose parents are suspected in his murder.

Jacsun Manson. (Culver City Police Department)

READ MORE: Children's Hospital Los Angeles Awarded $8.3 Million Grant To Study Long COVID In Children, Young Adults

Culver City police and volunteers were searching the El Sobrante Landfill located at 10910 Dawson Canyon Rd. in Corona for the body of Jacsun Manson before calling it a day Monday evening.

Jacsun was last seen on Dec. 31 with his parents, but was not reported missing until Jan. 25 by the Los Angeles County Department of Child and Family Services. It’s unclear exactly what lead to the delay in reporting his disappearance.

Police believe his parents, 34-year-old Adam Manson and 32-year-old Kiana Williams, killed Jacsun and discarded his body in a dumpster near the Baldwin Hills Crenshaw Plaza in the Crenshaw neighborhood of South L.A., police said. His body then may have ended up at the Corona landfill.

Adam Manson and Kiana Williams. (Culver City PD)

READ MORE: LA Takes Major Step Toward Banning New Oil, Gas Drilling In City

The couple were arrested Jan. 3 on charges of car theft. Arrest warrants for murder were issued for both this week, police said. They remain jailed in the custody of the L.A. County Sheriff’s Department.

Police search a landfill in Corona, Calif., for the body of Jacsun Manson. Feb. 25, 2019. (CBS2)

Prior to their arrest, the couple were driving a 2006 Chrysler PT Cruiser which they had stolen in November, police said. That vehicle was found abandoned in the 3300 block of West 54th Street in South L.A. on Feb. 8. According to police, witnesses reported last seeing Jacsun with his parents on Dec. 31 in that same PT Cruiser.

Police have described the couple as uncooperative as to the whereabouts of their son.

MORE NEWS: Student Stabbed At Miguel Contreras Learning Complex In Westlake

The couple had lived in a transitional apartment complex in Culver City called the Upward Bound House.