History Of Domestic Assault Connected To Murder/Suicide:

Michael Clavier (mug shot MDOC)

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New details are emerging about a married couple found dead in an apparent murder/suicide at 1407 W. Mt. Vernon in Springfield yesterday (07-12-11.)

According to court documents, forty six year-old  Michael F. Clavier beat up his then girlfriend, fifty three year-old Yvonne, and forced her to take more than 300 presciption pills before stabbing her in the chest and pubic area on November 7, 2008.

Michael Clavier told authorities he had been drinking and had no recollection of how Yvonne received her injuries.  Yvonne's son, William Michel, told cops he witnessed Clavier assaulting his mom and believed he was trying to kill her.

Yvonne Clavier

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Michael Clavier pleaded guilty to the assault of Yvonne In April of 2009 and received a suspended 7-year prison sentence and was placed on probation.  Four and a half months later Clavier violated the conditions of his probation and was taken into custody.  He spent three months in lockup before prosecutors withdrew their motion to revoke his probation and was released on January 1, 2010.
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The Clavier's were found dead in an upstairs bedroom (courtesy Springfield News-Leader)

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Over the next year and a half, Clavier violated his probation three more times - he was ordered not to have contact with his wife. He was also ordered into a program at the Salvation Army Family Enrichment Center in Springfield on July 30, 2010.  In August he was placed in a program at Harbor House.
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At the last hearing on the probation violation on June 14, 2011, Judge Calvin Holden ruled that Clavier could have contact with Yvonne as long as he wasn’t consuming alcohol.  He was also ordered to obtain a prescription for Antabuse and to begin taking it  According to court records, Clavier was living at Sigma House treatment center on June 24th, 2011.

In an unrelated case, Clavier was charged with DWI and driving while revoked on July 6th for a May 5th incident. A warrant was issued for his arrest on July 11th.
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UPDATE:

Autopsies reveal that both Yvonne and Michael Clavier died of sharp force trauma to the neck.