@abcnews: The boater accused of fatally striking a Florida teenager has released surveillance footage that he said shows he was unaware his boat had collided with the teen, according to his attorney. In the video, which was released by ABC affiliate WPLG, the boat operator appears to be calm after arriving back to the dock. The boat operator's attorney said this supports the claim that her client was unaware of the collision. Ella Adler, 15, was killed in the collision.