A Brooklyn woman was fatally stabbed Friday morning and police are now searching for her boyfriend.

The woman?s body was found on the sidewalk in front of her Bedford Avenue apartment building. Authorities say the victim had multiple stab wounds to her abdomen. Police also found the victim?s 12-year-old son with stab wounds to his neck in a fourth-floor apartment. He was taken to Kings County Hospital in critical condition.

Police found a knife on the front lawn several buildings away from the crime scene. They are now reviewing surveillance video for clues.

Investigators want to question 31-year-old Jacques Dorcinvil. Anyone with information on where the suspect may be should call Crime Stoppers at (1-800) 577-TIPS.