Rosary for Judge John Roll

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TUCSON, Ariz -- Thursday friends and family gathered for a rosary and visitation at St. Thomas the Apostle Catholic church.

Roll was killed shortly after leaving mass Saturday when he stopped by the Safeway to speak to Congresswoman Gabrielle Giffords.

More than 100 judges from around the country are expected to attend the funeral and pay respects.

U.S. Marshals say security will be very tight at the memorial.

The service and burial will be private.