Man accused of fatally stabbing wife pleads not guilty

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CHULA VISTA, Calif. – A man accused of fatally stabbing his estranged wife in a parking lot at a South Bay sheriff’s substation pleaded not guilty Friday to a murder charge and was ordered held on $5 million bail.

Marvin DuncanMarvin Dennis Duncan faces 26 years to life in prison if convicted of killing his 36-year-old wife, Rocio, said Deputy District Attorney Ted Minahan.

Shortly after 3:30 p.m. Wednesday, Duncan pressed an intercom button at a side door at the precinct house on Imperial Beach Boulevard, said sheriff’s homicide Lt. Glenn Giannantonio.

When a deputy answered, Duncan, who was holding two toddlers, announced he had just killed his spouse of three years, according to the lieutenant.

The mortally wounded victim was found lying on the ground on the west side of the substation. She died a short time later.

“He stabbed her repeatedly in the arm, chest, back of the head approximately 15 times,” said Minahan.

Duncan, 59, was detained for questioning and later arrested. The children, who were unharmed, were taken into protective custody.

Minahan said Duncan may have been motivated by the couple’s separation.

“Prior to the murder, the defendant was upset in regards to the separation with the victim as well as the child custody arrangement,” said Minahan.

Duncan will be back in court Feb. 21 for a readiness conference and Feb. 25 for a preliminary hearing.


  • Jus Amazed

    Hmmmm! It seems that so many women that are murdered by their estranged husbands. It makes me wonder why that is. Heavy child support, spousal support, can't even write kids off on taxes, very little visitation, taunting and tormenting ex and all sanctioned by the biggest bully, San Diego County Superior Court and their posse.
    Nope taking everything a man has to live for can't be it. Gotta be just a man thing. Take more from us, take more.

  • Anna Fielding

    thats crazy…i knew him…he used to go to the same gym as me…he is like a body builder and he was married to a different woman at the time…this was like from 1995 to 1999……god thats terrible …i bet his ex-wife back then was glad she divorced him…so sad

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