An eagle-eyed tourist captured dramatic photos of a young murderer calmly walking off moments after he fatally stabbed a passer-by on the steps of the main post office in Midtown Manhattan, authorities said yesterday.

The German visitor caught the coldblooded killer on his camera as the fiend went to retrieve his cellphone near the scene before fleeing again, sources said.

The murderer had dropped the phone on the ground during his sudden, heinous attack on 20-year-old Christopher Gutierrez in broad daylight Sunday, law-enforcement sources said.

The tourist hadn't even seen the slaying — and didn't realize what he had on his camera until afterward, the sources said.

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