Photo Gallery: Brock McCann memorial tree

Murphy McCann, left, embraces his son Jack, Brock’s older brother, as they watch students add dirt to a memorial tree in honor of Brock during a special event at Newport Heights Elementary School in Newport Beach on Thursday.

Third-grader Brock McCann, 8, was hit and killed by a trash truck while riding his bike home from school one year ago.

Bernadette McCann and principal Somer Harding, left, hug as students add dirt to a memorial tree in honor of Brock McCann during a special event at Newport Heights Elementary School in Newport Beach on Thursday.

Murphy McCann, left, and wife Bernadette hug by a memorial tree planted in honor of their son Brock during a special event at Newport Heights Elementary School in Newport Beach on Thursday.

Students shovel dirt around a memorial tree planted in honor of Brock McCann during a special event to honor him at Newport Heights Elementary School in Newport Beach on Thursday.

Newport Heights Elementary School holds a special event to remember third-grader Brock McCann in Newport Beach on Thursday.

Third-grade teacher John Daffron, who was Brock McCann’s teacher, performs “Puff the Magic Dragon” as Newport Heights Elementary School holds a special event to remember Brock on Thursday.

Brock McCann’s parents and grandparents sit among loved ones during a special event to remember the one-year anniversary of his tragic bicycle accident. Brock was hit and killed by a trash truck while riding his bike home from school one year ago.

Newport Heights Elementary School fourth- and fifth-graders sing “You’ve Got a Friend in Me” as the school holds a special event to remember third-grader Brock McCann on Thursday.

Principal Somer Harding speaks during a special event in honor of third-grader Brock McCann on Thursday.