The Fox Meadow Campus of Putnam Northern Westchester BOCES was put on lockout this morning after a former student called threatening to shoot  the principal there, police said.

According to Yorktown Police Lt. Kevin Soravilla, a call was received around 9 a.m. and the campus was promptly locked down.

The Westchester County Medical Examiner's Office has completed an autopsy on the body of 43 year old Piotre Seweryn. Yorktown Police Lieutenant Kevin Soravilla says the M.E.'s report has ruled out suicide as a causeof death.

Seweryn's wife Krystyna  made the gruesome discovery in the basement of their home at 3210 Poplar Street around 1 p.m. Wednesday. Police say whoever shot Seweryn in the head likely targeted him and that it was not a random act.

Soravilla added,"It was not a home invasion. Nothing was disturbed and nothing was stolen from the home."

Yorktown Police Thursday are seeking to calm the public following the town's first murder in more than 15 years. Yorktown Police Lieutenant Kevin Soravilla said residents in the quiet suburban community need not panic.

He says the death of 43 year old Piotr Seweryn was not a home invasion. Rather, he says, the victim, who was shot once in the head was likely targeted, for reasons police have not yet disclosed.

Seweryn's wife Krystyn made the gruesome discovery around 1 o'clock Wednesday afternoon in the basement of their home at 3210 Poplar Street.

Yorktown Police say an arrest had been made in last week's armed robbery of Yorktown Jewelers at 2008 Crompond Road.

Police Lieutenant Kevin Soravilla says his Department was contacted by a jewelry store owner who had surveillance cameras set up at their store in the Bronx, and noticed a man matching the description of the assailant. Yorktown Police, assisted by members of the NYPD moved in to arrest the suspect, identified as 63 year old Daniel Gastin of the Bronx. He's been charged with First Degree Robbery, Second Degree Criminal Possession of a Weapon, and First Degree Unlawful Imprisonment. Officials say Gastin stole $15,000 worth of cash and jewelry from the store at gunpoint and tied up the workers at the store.

Gastin has a criminal past, and was convicted of three robberies back in the 1980's.

He's been remanded to the Westchester County Jail without bail and is due back in Yorktown Town Court on June 29.