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PHILADELPHIA (CBS) — Police are searching for a killer after a man is stabbed to death in front of a home in North Philadelphia. It happened on the 3100 block of Stillman Street around 1:30 a.m. Wednesday.

Officers found the 43-year-old victim lying on the front steps of the home. He had been stabbed once in the neck.

Two children under the age of 2 were inside the home. One is the victim’s son and the other is his nephew. Neither were hurt.

Police are trying to figure out what started the deadly violence.