After an 18-year-old was killed at a post-prom party, the victim’s father had a message for his son’s murderer and said “You picked the wrong family to f--- with.”

According to CBC News, Brandon Volpi was fatally stabbed at an after-prom bash on Saturday outside the Les Suites Hotel in downtown Ottawa.

Paramedics arrived shortly after 3:30 a.m. to find Volpi suffering from a knife wound to his chest and neck. Authorities believe a group of students from a rival high school stabbed him as he tried to stop an altercation.

After his father Danny Volpi learned of his son’s death he took to Facebook to voice his emotions.

“To my dear son may you rest in peace. I miss you with all my heart,” Volpi posted. “May justice be served and find who killed my son.”

The New York Daily News noted that the grieving father then directed a message at his son’s killer.

“To the coward who killed my son. Come try me. You picked the wrong family to f--- with.”

The messages were later taken down.

Hundreds mourned the loss of the popular high school student at a vigil on Sunday evening outside the hotel where he was stabbed.