MIAMI — A student at the Florida high school where 17 people were killed in a mass shooting last year apparently took his own life on Saturday, the police said. It was the second apparent suicide in the span of a week involving a student survivor of the shooting in Parkland, a community still reeling from the aftermath of the massacre.

Officers in Coral Springs, Fla., responded Saturday night to the apparent suicide of a minor who attended Marjory Stoneman Douglas High School in Parkland, Officer Tyler Reik, a police spokesman, confirmed on Sunday. He said the death was still under investigation.

Ryan Petty, who lost his daughter Alaina during the massacre at Stoneman Douglas on Feb. 14, 2018, said the child who died on Saturday was a 16-year-old boy. Mr. Petty alluded to the boy’s death in a Twitter post late Saturday, in which he wrote “17+2” with an emoji of a broken heart.

“What we feared could happen is happening,” Mr. Petty said in an interview.

The foundation that he created in his daughter’s memory held an event last May trying to raise awareness about suicide prevention.