The young actor he will play Claire Bennet's (Hayden Panettiere) boyfriend, West, who is said to have "a very cool superpower."
D'Agosto is the second new addition to the cast of Heroes for next season, joining recently appointed new regular Dania Ramirez.
This past development season, D'Agosto co-starred opposite Marisa Tomei in CBS' comedy pilot The Rich Inner Life of Penelope Cloud. Last year, he played the male lead opposite Mena Suvari in another CBS pilot, the drama Orpheus.
D'Agosto will next be seen in the indie Rocket Science, which premiered to strong reviews at the Sundance Film Festival in January.