A box cutter-wielding creep urinating on a car in the East Village slashed the neck of a passerby who asked him to stop, police said.

The 66-year-old victim was left clinging to life after confronting the sicko, who was relieving himself on a car at East 14th Street near First Avenue just after 5 p.m. Sunday, cops said.

Photos released by the NYPD early Monday show the bearded suspect wearing a red and black winter coat, gray hat, black pants and pushing a rolling duffle bag.

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Cops said he used a box-cutter to slash the stranger, causing a severe cut and bleeding.

The victim was taken to Mount Sinai Beth Israel, where he was listed in critical condition.

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The alleged assailant ran off, and was still on the loose Monday.