Bedfordshire Police identified a 38‑year‑old man on Wednesday as the principal suspect in the murders of his wife and both daughters.
Police located the bodies at their residential home in Bedford on Tuesday.
The man departed the UK immediately after the discovery.
Authorities have not yet explained how he left or where he is possibly now.
Bedfordshire Hospitals observed 25 years since its Metabolic Institute opened.
The unit has assisted many people with rare diseases.
A local cyclist also finished a 560‑km London‑to‑Paris ride in three days.
He did it to gather money for MS Society.