By CRAIG FREILICH

POTSDAM -- St. Lawrence County District Attorney Mary Rain said she will present evidence in the Thursday stabbing and shooting deaths in Potsdam to a grand jury.

For more details on the double fatality, view earlier story.

Rain said it is “standard practice to present to a grand jury” evidence in an officer-involved shooting.

“We want to ensure the public that the police did everything properly,” Rain said.

Ptl. Matthew Seymour, an 11-year veteran of the Potsdam Police Department, shot and killed a man at Swan Landing apartments Thursday afternoon after a neighbor called police and Seymour responded.

Seymour shot a man that was stabbing a woman and himself when he arrived, according to a report from New York State Police. Seymour was said to have ordered the man to drop his knife several times and was shot after he refused to comply. Neither the man nor the woman survived.

Seymour has told the DA’s office that he will testify at the grand jury, Rain said.

She said the grand jury will hear evidence to determine if the shooting “was a homicide that was justified by the officer defending himself or a third party.”

The two people killed in the incident yesterday were Clarkson University students, according to police.

Representatives of several police agencies, including Potsdam police, state police, the St. Lawrence County Sheriff’s Office, and DEC, responded to the scene, along with the Potsdam Rescue Squad.

The investigation continues.