Alan York Zagorny, the man who allegedly drove his car onto a shoulder of the Capital Beltway, striking and fatally injuring a Prince George's County police officer earlier this month, was arrested yesterday and charged with manslaughter by auto.

Police said Zagorny, 26, of 2802 Quay Ave., Forestville, is accused of being under the influence of the drug PCP at the time of the accident Dec. 6.

Zagorny is charged in the death of Cpl. Allan Dale Johnson, 41, who was standing behind a van writing a traffic ticket when he was hit by a car that had veered off the Beltway's northbound lanes near the Central Avenue exit in Capitol Heights.

Johnson died two days later in Prince George's General Hospital. Zagorny, also injured, was hospitalized for several days. He was jailed yesterday in Upper Marlboro in lieu of $75,000 bond. If convicted of manslaughter by auto, he could receive a sentence of up to five years in prison and a $1,000 fine.

Police said that at the time of the accident Zagorny was free on bond on assault charges stemming from an October incident in which he allegedly held his 5-year-old daughter hostage following a domestic dispute.