Doctor testifying in defense of Michelle Carter

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TAUNTON, Mass. — The defense is putting a doctor on the stand Monday as they work to clear the name of a Plainville woman accused of encouraging her boyfriend to kill himself.

Prosecutors say that in 2014, 17-year-old Conrad Roy and Michelle Carter were in a relationship and that she eventually sent him text messages supporting his plan to commit suicide.

The case could wrap up as early as next week; Carter waived her right to a jury trial, so her fate sits in the hands of a judge.

Carter, now 20, could be in prison up to 20 years in convicted of involuntary manslaughter.

The doctor is expected to testify about an addiction Carter has.