Mentioned in Harry Potter: The Dark Lord's Downfall
In 1998, whilst at the Doctors for a checkup, Connor and his mother, Joanne were attacked by Death Eaters and taken to Azkaban prison. They were tortured for information and later killed as an expense. He was three years old.
Connor's older sister, Faye, survived the Death Eater attack on her home and was later found by Phoebe Blackheart. She was taken into care and later adopted by Phoebe and her husband Terence Higgs.
See Faye Higgs for more information.