"I worked on Amanda's show when she had her show," Cannon explained. "To see someone you'd seen at 9, running around with a snotty nose, and now to see her like that is like, 'Wow, man! That's sad.'"
He also added that he's since tried to get in touch with the former Nickelodeon star to no avail.
"I tried to reach out," he told Stern, but hadn't been able to reach her.
Cannon isn't the only one who is expressing support for Bynes.
Since his tweet, Bynes lashed out against Dr. Drew's comments, causing him to apologize for making his opinion on the matter public.