Four people have been arrested in connection with the murder of a 48 year-old from Ilkeston.
Two men, aged 26 and 34, have been arrested on suspicion of murder while a 26 year-old man and 46 year-old man are being held on suspicion of conspiracy to commit murder.
They remain in police custody under questioning.
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A senior court prosecutor from Worcester stabbed his wife in the head as she slept after a bout of depression brought on by work pressures.
A man has appeared at Birmingham Magistrates Court charged with the murder of another man who was found dead in Coventry on Monday night.
"This was an incident of domestic violence of the highest severity which sadly had tragic consequences."