BBC reports Oxford Astronomy Prof Steven Rawlings found dead
"A 49-year-old man has been arrested on suspicion of murder. "
Oxford Mail has more details and updates.
Update: may be coroner's inquest, not murder inquiry - Rawlings' widow says she thinks Dr Sivia (man initially held) is not guilty of murder and death was an accident.
Indeed, the details given in the latest articles suggest (at least to me) that there was no foul play.