Authorities have identified a man fatally shot by a state trooper Friday near a Boston riverside park.
The Suffolk district attorney's office, which is investigating, said 45-year-old Santos Laboy of Somerville was sought on outstanding warrants.
State police Col. Timothy Alben said Boston University officers first approached Laboy because he matched the suspect's description. Alben said Laboy pulled a knife and ran through the Esplanade along the Charles River.
He said a trooper confronted Laboy on a footbridge over Storrow Drive, and shot Laboy when he refused to drop the knife and made threatening gestures. Several people witnessed the shooting.
Alben said Laboy had a long criminal record. The new charges included harassment and annoying a person of the opposite sex.
Laboy's sister Olga Santiago said Saturday she doesn't understand why the officers couldn't subdue him without killing him.
