O'Mara also answered questions revolving around the state of Zimmerman's donations given by his supporters.
O’Mara released a statement Monday responding to the allegations and in it, he said his client was not yet 8 years old when the alleged abuse began, and that he was 17 when it ended. O'Mara said the woman is Zimmerman's cousin.
In a motion filed June 18, O'Mara called the accuser's statement "not relevant to the issues of this case," and said the allegations are inadmissible.
He added that its disclosure risked leading to "widespread hostile publicity which would substantially impair the Defendant's fair trial rights, and would pose a serious threat to the administration of justice."
Appearing on CNN's Piers Morgan Tonight Monday evening, O'Mara continued to defend his client, saying:
"There actually were some other events that happened in the family dynamics that we will get into if we need to…She makes up allegations about sexual abuse, then also seemingly doesn't have any corroboration to them."
When it came to the issue of Zimmerman’s donations, O’Mara said:
"It’s a unique situation and we have to deal with the fact that George doesn’t have money of his own and can only get those funds from his supporters and the comments from those supports have shown a variety of support."
Zimmerman is charged with second-degree murder in the February 26 death of Trayvon Martin. The 17-year-old Martin was unarmed when he was killed while walking back to his father's girlfriend's house in a gated residential area of Sanford, Florida.
Zimmerman has pleaded not guilty. He has said he shot in self-defense after Martin attacked him.
Watch as O’Mara defends his client against the allegations of “Witness 9."