Eighteen hour stand-off ends in arrest of homicide suspect

MARTINEZ, Calif. – A near nineteen-hour stand-off between law enforcement and a suspected homicide suspect ended in the arrest of a Martinez man last week.

Thursday afternoon, April 27, Walnut Creek Police Department received several reports that a female had been shot in the street in the 1900 block of 1st Avenue in Walnut Creek, near the Lindsey Wildlife Experience.

Officers arrived on scene two minutes later and found a female, Roselyn Policarpio, 47, of Martinez, had been shot multiple times. Officers and medical teams provided life saving measures, however, Policarpio did not survive her injuries and was pronounced deceased. Witnesses stated a male suspect had shot the victim, entered a silver Chevy sedan and fled the scene. He headed south on Buena Vista Avenue. Witnesses could only provide a partial license plate at the time.

The suspect abandoned the vehicle on Lynvale Lane and fled on foot. Approximately one hour late later, officers and detectives located the vehicle on Lynvale Lane. A contingent of SWAT officers, K9s, patrol officers and a California Highway Patrol helicopter searched the area. The K9 tracked the scent of the suspect to a residence on San Luis Road. Walnut Creek Police Department set up a perimeter around the house, closed San Luis Road and activated the SWAT Team (Central County SWAT, which is Walnut Creek Police, San Ramon Police, Martinez Police, Pleasant Hill Police and BART Police).

At approximately 6:55 p.m., two Walnut Creek Police officers spotted the suspect riding in the front passenger seat of a silver Mercedes in Martinez. With the help of Martinez Police officers, they did a high risk traffic stop on Howe Road and Arnold Road. During the traffic stop, the driver exited the vehicle and was detained, interviewed and later released.  Subsequently, the suspect put a gun to his head, remained in the vehicle and stated he was going to harm himself. Officers controlled the scene and after approximately 20 minutes, they were relieved by Central County SWAT and their negotiators. The negotiations continued throughout the night and the afternoon of the next day. At approximately 2 a.m., Contra Costa County Sheriff’s SWAT Team relieved Central County SWAT, which is normal in a long term event. Central County SWAT took over the event later in the morning.

During the negotiations, the suspect accidentally fired his handgun through the windshield. No one was hurt due to this firing. The suspect finally surrendered peacefully the afternoon of Friday, April 28.

Gregory Prokopowicz, 38, last known address in Martinez, was arrested and charged in the death of Policarpio.

Prokopowicz has since entered a plea of not guilty, against the advice of his public defender.

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