FORT LAUDERDALE, Fla. - A California man has been convicted of posting online threats and sending malicious messages to relatives of victims of the 2018 Florida school shooting.

Court records show 22-year-old Brandon Fleury of Santa Ana, California, was found guilty on Tuesday by a federal jury of cyberstalking and threatening a kidnapping. He faces up to 20 years in prison at sentencing Dec. 2.

Trial evidence shows Fleury used 13 different Instagram accounts to target people close to the 17 high school students and staff killed in the mass shooting at Marjory Stoneman Douglas High School. One message read “I killed your loved ones ha ha ha.”

Many of Fleury’s messages used the photo of 21-year-old Nikolas Cruz, who faces the death penalty if convicted of the shootings.