Anthony Head

Sarah Michelle Gellar is mourning the death of her "Buffy the Vampire Slayer" costar Anthony Head ... and her tribute is sure to make fans bawl. Not long after news broke that Head -- who played Rupert Giles -- died of complications from pneumonia ... SMG shared her heartbreak on Instagram. Along…

Actor Anthony Head, who shot to fame playing Rupert Giles on "Buffy the Vampire Slayer" before playing Rupert Mannion on "Ted Lasso," is dead.According to his daughters, actresses Emily and Daisy Head, Anthony died of complications from pneumonia. They say he went peacefully, surrounded by family.…