Susannah Bellingham was admired by her peers and Ravenclaw housemates alike. She had brains, blonde hair and pretty blue eyes. She was the typical girl next door. And for one of her classmates, a livelong unrequited love.

Born in 1963 Susannah grew up on the south coast in Bournemouth. She was the apple of her father's eye. Augustus was a respected Ministry worker with the Department for International Magical Co-operation. He hoped his daughter would follow in his footsteps in London. He was always proud of her in Ravenclaw his own house.

Meanwhile born in 1962 Lawrence Musgrave grew up in St Albans. He was the younger of two children. He grew up in his sister Cynthia's shadow. Son of Anthony (once director of the Knight Bus) and August he was sorted into Gryffindor the same night the Hat shouted for Susannah. An infatuation began.

"He always fancied her." Classmate Gladys-May Shufflebottom tells me. We sit together in the Shufflebottom family home. William Shufflebottom Gladys-May's husband was convicted of terrorism charges involving dementors at the start of February. Mr Shufflebottom was aiding Musgrave. He is considered the dark wizard's closest confidante. His imprisonment leaves Gladys-May to continue to raise their two children alone.

"She wasn't even that pretty." Gladys-May asserts. She offers me a photograph from the late 1970s where she and Susannah were together at school. Gladys-May is formerly Gladys-May Carter and the cousin of St Mungo's Head Healer Miranda Storm though "poor relation" in Shufflebottom's words. Storm is another of Musgrave's obsessions.

"My Willy used to tease Susie. Nothing strong mind but Lawrence punched him for it." Were the two boys competing for the affections of Bellingham back in Hogwarts? "Of course not. They were teenagers. Silly idiots." Gladys-May dismisses my theory.

Despite seven years at school together Gladys-May says there was no indication Susannah was ever more than friends with Lawrence Musgrave. His interest was clear though. "But he never asked her out. She had boyfriends."

After leaving school Musgrave trained to be an auror. He still kept in touch with Bellingham. Friends of both at the time say Musgrave's affections were unrequited though it was a constant will-they-won't they. Reportedly Lawrence once threw one of her boyfriends out of The Leaky Cauldron. Was it this night which led Musgrave back to the historic pub to destroy it last November?

Susannah Bellingham died of illness in 2008, while Musgrave served time at Azkaban for war crimes. He was to discover upon his release in 2010, when he hoped to reunite with her. He would never get to see her again. She died November 5. Did her death send him over the edge?