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Rochester, MN (KROC AM News) - Prosecutors say the inmate who attacked an Olmsted County detention deputy last month has a history of violence that has a common theme - he goes after the victims’ heads.

And that history was used to file a serious assault charge against the Dover man.

The Olmsted County Attorney’s Office has filed three assault charges against 32-year-old Joseph Martin. One alleges Martin “specifically intended to inflict substantial bodily harm when he targeted” the victim’s head.

Joseph Martin/Olmsted County ADC
Joseph Martin/Olmsted County ADC
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The victim in this case was another inmate in the Olmsted County jail. Martin is accused of attacking the inmate and then turning on the 70-year-old deputy when he tried to intervene. The deputy was also punched in the head.

The new criminal complaint lists two other violent incidents Martin was charged with.

One was a 2019 attack on another inmate at a state prison where Martin was serving time for physically and sexually assaulting his girlfriend. The other incident happened last summer when he knocked out two men at a bar in Dover after repeatedly punching the victims in the head.

Olmsted County Attorney
Olmsted County Attorney
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Martin was scheduled to be sentenced this week for the Dover incident and for assaulting his girlfriend in January. The sentencing was delayed because of the new case.

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