Al Ka
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Sybil Theresa Appelquist (Nee Hornby)
It was a padded envelope delivered to Bridlington police station containing a suicide note and a key to the home of Sybil and John Appelquist which prompted a huge search in November 2002.
The note was sent from John, who officers later found at the house with both his wrists slashed in a suicide attempt.
He told them his wife had left him, and he was taken to hospital in Scarborough where he was to remain for several weeks. From that point on police launched a missing persons inquiry for Sybil, which was to become one of the biggest and most detailed investigations the force had undertaken.
It would lead to the conclusion that Sybil had "ceased to exist" and could have been missing for up to a year.
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She had vanished without taking any personal possessions including her passport or money. The garden was dug up, a nearby lock-up garage searched.
John Appelquist was arrested on suspicion of murdering his wife. He went on trial at Hull Crown Court at the beginning of 2004 but was cleared of his wife's murder.
"This was a forensic examination that lasted a year," Mr Smith said.
The notorious murders police have found most difficult to solve


It was a padded envelope delivered to Bridlington police station containing a suicide note and a key to the home of Sybil and John Appelquist which prompted a huge search in November 2002.
The note was sent from John, who officers later found at the house with both his wrists slashed in a suicide attempt.
He told them his wife had left him, and he was taken to hospital in Scarborough where he was to remain for several weeks. From that point on police launched a missing persons inquiry for Sybil, which was to become one of the biggest and most detailed investigations the force had undertaken.
It would lead to the conclusion that Sybil had "ceased to exist" and could have been missing for up to a year.
---
She had vanished without taking any personal possessions including her passport or money. The garden was dug up, a nearby lock-up garage searched.
John Appelquist was arrested on suspicion of murdering his wife. He went on trial at Hull Crown Court at the beginning of 2004 but was cleared of his wife's murder.
"This was a forensic examination that lasted a year," Mr Smith said.
The notorious murders police have found most difficult to solve