Singer was previously charged in February with 10 counts of aggravated criminal sexual abuse.
Television host maintains his innocence following accusations by multiple women.
Actor called out the comedian for “toxic behavior” in a series of tweets.
“I’m sorry, both for my poor judgment when I was young, and for not speaking out sooner.”
“You wouldn’t believe the worst without evidence, would you?” he asks.
Investigators claim Moonves was “evasive and untruthful.”
Cosby is currently serving a three to 10 year prison sentence for sexual assault.
“Why is it so hard to talk about?” Lemon asked viewers.
Comedian was sentenced to three to 10 years in state prison Tuesday in Pennsylvania.
Comedian faces up to 30 years in state prison for sexual assault.
“I am sorry for all of it,” a portion of the letter reads.
Prosecutors also declined to file charges in separate cases involving Kevin Spacey and Steven Seagal.