Man confesses to killing wife at IB sheriff's substation - CBS News 8 - San Diego, CA News Station - KFMB Channel 8

Man goes to Imperial Beach sheriff's substation, confesses to killing wife

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Rocio Duncan, 36 - Courtesy: CA DMV Rocio Duncan, 36 - Courtesy: CA DMV

IMPERIAL BEACH (CNS) - A 59-year-old man was in custody Thursday after confessing to stabbing his wife to death in the parking lot of the sheriff's Imperial Beach substation, authorities said.

Marvin Dennis Duncan was arrested Wednesday and booked into San Diego Central Jail on suspicion of one count of murder in the death of Rocio Duncan, 36, according to San Diego County sheriff's Lt. Glenn Giannantonio.

Around 3:40 p.m. Wednesday, a man - later identified as Duncan - walked up to a side door at the substation on Imperial Beach Boulevard and pressed an intercom button, the homicide lieutenant said in a statement.

When a deputy opened the door, he saw a man who was holding two toddlers and who said he had just killed his wife, Giannantonio said.

The victim was found on the west side of the substation lying on the ground and suffering from stab wounds. She was still breathing when deputies found her but died a short time later, he said.

The man was immediately detained at the scene and the children taken into protective custody, Giannantonio said. The children were not injured. The motive for the slaying was under investigation.

Anyone with information about the case was asked to call homicide detectives at (858) 974-2321 or after hours at (858) 565-5200.

This is a story update. The previous story is below.


SAN DIEGO (CBS 8) –  A man rang the buzzer at the sheriff's department substation in Imperial Beach Wednesday afternoon and told authorities he had stabbed his wife to death in the parking lot, according to Sheriff's homicide detectives.

Deputies found a woman suffering from stab wounds in a pick-up truck outside the building in the 800 block of Imperial Beach Boulevard. She was still alive, but died before paramedics could arrive to administer medical help.

Deputies say the man was carrying two toddlers when he entered the substation. The children were taken into child protective custody and were not injured.

News 8 has learned that the registered owner of the pick-up truck is 58-year-old Marvin Duncan Sr., of Encanto.

Investigators were at Duncan's home Wednesday night, waiting to serve a search warrant so they could enter and look for potential clues and evidence.

A neighbor told News 8 that Duncan was going through a bitter custody battle and divorce with his wife. The neighbor also said Duncan is the father of two young children, possibly the same children he was holding when he arrived at the sheriff's substation.

Court records show that Marvin Duncan Sr. filed a paternity lawsuit in 2010.

The identities of the suspect and the stabbing victim have not been released by investigators.

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