Bedfordshire Police listed a 38‑year‑old man on Wednesday as the chief suspect in the murders of his spouse and both daughters.
Police found the bodies at their family home in Bedford on Tuesday.
The man departed the UK immediately after the discovery.
Authorities have still not explained how he left or where he could be now.
Bedfordshire Hospitals marked 25 years since its Metabolic Institute opened.
The unit has helped many people with rare diseases.
A local cyclist also finished a 560‑km London‑to‑Paris ride in three days.
He did it to collect money for MS Society.