CHICOPEE, MA — A teenager and his mother are dead after the 15-year-old stabbed his mom and shot himself, authorities said.

Mary Danehy, 50, of Chicopee, suffered multiple stab wounds that appear to have caused her death, according to the Hampden District Attorney. Joshua Guyette, 15, appears to have died from a single gunshot wound, and a firearm was recovered near his body.

Responding to a medical alert in the unit block of Lauzier Terrace, the Chicopee Fire Department arrived shortly before 1 p.m. and was met out front by John Danehy, Mary Danehy's father and Guyette's grandfather. John Danehy told medics that he heard a disturbance in the home, including a gunshot. The first responders called police to the residence.