Zimmerman raised the money through a bizarre website, which he set up before his arrest. This week, the site was ordered shut down by O'Mara.
At a hearing last week, Zimmerman's wife and father both said they had little money to pay for him to be released from jail should a judge grant him a bond. His father said he might have to take out a second mortgage out on his house to pay for it.
With that in mind, the judge set the bond amount at $150,000. Zimmerman's family would have had to pay 10 percent, or $15,000, to secure his release.
Prosecutors had asked that Zimmerman be held in jail or granted a bond of no less than $1 million.
Zimmerman's family was able to put together the $15,000 in just a few days and he was released early Monday morning from a Seminole County jail.
Zimmerman has been charged in second-degree murder in the killing, which has drawn international attention.
Watch an excerpt of the interview with O'Mara: