A Northshore cop has killed a suspect. State Police are investigating after a Tangipahoa deputy shot the man in Hammond. Trooper Greg Marchand says it started as a domestic call on Deborah Drive. The Sheriff's office says deputies arrived at the home around 2:00pm to find man with a knife hurting a woman. Investigator say the woman's life was threatened, so a deputy shot the suspect. State Police say 48-year-old Michael Nichols died as a result. It was the suspect's mother, 70-year-old Barbara Nichols, who called police for help. She was hospitalized. The sheriff's office says it is protocol to have troopers investigate deputy involved shootings.