One man and two teens have died following a shooting in Watertown last night.  A woman called 911 shortly before 10pm and reported that her boyfriend shot her teenage son and daughter.  15-year-old Della Jette and 16-year-old Sterling Jette Jr., died at the hospital.  42-year-old Paul Ferguson was found dead at the home with an apparent self-inflicted gunshot wound. 

Police say Ferguson is a convicted felon and was disqualified from possessing a firearm. 

Police say Della returned from a school field trip and started loudly discussing with her mother about Ferguson smoking cigarettes in the house.  Ferguson, who was downstairs with Sterling, told her to quiet down and not speak to her mother that way.  Police say he went to the bedroom, came back with a Glock handgun that was kept in a safe and shot Sterling in the leg when he tried to intercede. 

Police say the girl was found on the deck.  The boy was found between the kitchen and living room.  Each suffered a gunshot wound to the chest.

Ferguson had been dating the mother for two years and moved into the home about two weeks ago. 

Watertown Superintendent of Schools Rydell Harrison in a message to parents Wednesday said the victims were former Watertown students, but not currently enrolled at Watertown High School.  Crisis teams are being made available Wednesday at the high school and middle school to help students and staff.