The South Carolina state senator and church pastor was among the nine people who were shot to death during a bible study inside the Emanuel African Methodist Episcopal Church on June 17.
Now referred by attendees as the "Reverend President," Obama delivered a moving speech in honor of the "People so full of life and so full of kindness, people who ran the race and persevered, people of great faith."
"To the families of the fallen, the nation shares in your grief," he added.
America's first black president also mentioned about the killer, 21-year-old Dylann Roof,