The makeup artist from Luton, a mother of three, was found in the garden.
"This case is being treated as an unnatural death and intensive investigations are ongoing," Mr. Griffith said.
"At this stage there is nothing to indicate that an intruder was present."
A man who once lived in the house was interviewed, but Mr. Griffith said he wasn't involved in her death.
Mrs. Crichlow's niece said she was worried that the police did not consider the investigation a murder investigation.