SANFORD, Fla. -

A judge in the case of a former neighborhood watch leader accused of shooting Florida teenager Trayvon Martin has denied a defense request to delay the trial, which is currently set to begin on June 10.

George Zimmerman has pleaded not guilty to second-degree murder, claiming he acted in self-defense.

Zimmerman's attorneys presented a motion Tuesday asking Judge Debra Nelson to push the trial from mid-June back to November. They say the prosecutor has been slow in turning over needed evidence. The state attorney denied the accusation.

Nelson noted Zimmerman's lead attorney, Mark O'Mara, has been in the case nearly a year and says the problems he's having getting evidence are not insurmountable.

Outside the Seminole County Courthouse, supporters of Martin gathered to mark what would have been his 18th birthday.