Thames Valley Police have confirmed they are launching an investigation into an abusive voicemail received by Dr Sara Ryan.
A spokeswoman said the message, allegedly sent by an employee of Southern Health, "has now been recorded as a report of a malicious communication and is currently under investigation."
The chief executive of under-fire Southern Health trust will keep her job, despite widespread criticism over unexplained deaths.
The future of Southern Health NHS Trust chief executive Katrina Percy is under scrutiny as part of a review by the interim chair.
Southern Health will launch a full investigation into an alleged 'abusive' voicemail sent to Dr Sara Ryan, mother of Connor Sparrowhawk.