George Zimmerman, a neighborhood watchman accused of gunning down an unarmed 17-year-old African-American, has turned himself in to the Seminole County Jail in Sanford, Fla.

George Zimmerman’s bond has been revoked after misleading the court on his finances and a second passport.

“I wanted to say I am sorry for the loss of your son,” Zimmerman told Martin’s parents on the witness stand. “I did not know how old he was. I thought he was a little bit younger than I am. I did not know if he was armed or not.”