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Man Carrying Tots Reports Killing Wife Near Sheriff’s Substation, Authorities Say

Marvin Duncan rang sheriff’s intercom to say he killed his wife in the parking lot, says department.

Updated at 4:25 a.m. Feb. 7, 2013

Carrying two toddlers in his arms, a San Diego man rang the intercom button Wednesday at the Imperial Beach sheriff’s substation to report a murder.

He had just killed his wife, he reportedly said.

Homicide Lt. Glenn Giannantonio said Marvin Duncan, 59, rang the substation’s button around 3:40 p.m. to inform deputies of the crime.

“The deputy detained the man and the children were taken into protective custody,” Giannantonio said.

The children were not injured, he said.

Deputies went outside to find Rocio Duncan, 36, suffering from multiple stab wounds outside a Nissan Titan truck.

“The woman was still breathing but succumbed to her injuries shortly after she was discovered,” he said.

Marvin Dennis Duncan was booked into County Jail at 3:07 a.m., according to jail records, and was being held on first-degree murder charges with no bail. He is to be arraigned at 1:30 p.m. Friday at South County Superior Court in Chula Vista.

The Sheriff's Department shares the parking lot in the 800 block of Imperial Beach Boulevard with City Hall, the Imperial Beach Public Safety Department and Imperial Beach Fire Department.

Imperial Beach Boulevard between Delaware and 9th streets were closed off Wednesday, and City Hall and the sheriff’s substation were surrounded with "Sheriff's Line Do Not Cross" tape during the investigation.

Sha-Ron Cobb had just finished walking her dog at the beach and stopped at the library when she saw the sheriff's department responding and several city employees leaving City Hall.

“I thought maybe it’s like a bomb threat,” she said.

Zeke Mazur, 72, mistakenly thought a City Council meeting was scheduled to take place Wednesday and was on his way to City Hall. 

Mazur has lived in Imperial Beach for decades, rides his bike everywhere and still considers IB a safe place to live.

“It’s amazing,” he said. “I’ve never heard of anything like this happening before in Imperial Beach.”

Merlinda and James Cobb live a little over a block away on 7th Street and were out walking their dog when they were stopped by police tape.

“It’s crazy,” Merlinda said. “We walk here all the time. It’s too close to home.”

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

IBRalph February 07, 2013 at 08:41 PM
If you visit the location, you would understand why no one in the Sheriff's substation would be aware of something happening in the parking lot. The parking area is beyond the door, maybe 10 yards or so. The lobby is very small and with a tall counter where visitors would talk to an office receptionist. The receptionist cannot see over the counter. If the receptionist is away from her desk, a visitor would ring a bell. The wall of the office is solid concrete blocks with no windows, so a deputy would not see the parking lot nor hear any commotion. The victim was lying on the ground next to the passenger-side door of the truck, so even if a receptionist was in the lobby, that view would be out of sight. I feel really sad that the young children would be traumatized this way. I cannot imagine a parent doing something like this in front of small children, no matter how angry he was at his wife.
Nancyib February 07, 2013 at 11:26 PM
Thank you for your correct description of that area.
Chico&The Man February 10, 2013 at 07:22 PM
you can find them on elm st trying to surprise ticket someone for an open container on a daily basis...
Notimeforignorance February 11, 2013 at 05:46 AM
Oh. You mean they're doing their JOBS?! You say it like as if it were a bad thing. You must have been one of the idiots that got ticketed for said offense.
Chico&The Man February 11, 2013 at 08:25 PM
that's the problem theyre not even worthy of being able to even write a ticket. they have these fresh out of county jail deputies that are dumb as shit patrolling asking surfer types if they belong to gangs the last time they were supposedly doing there job i had the beach rental for a few days and it was comedy watching them repeatedly drive away looking dumbfounded..they should stick to playing drunk to bust ib shopkeepers...as part of there work routine......and continue to spend 30 - 45 min cruizing the pier looking for them open containers ..that's there job for sure....

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