SIOUX FALLS, S.D. (AP) — The case of a man accused of killing his mother and nephew in Sioux Falls is on hold until the court determines whether he's competent to stand trial.

Attorneys for 25-year-old Heath Otto say a doctor has found him incompetent. The Argus Leader reports a hearing will eventually be held on whether Otto is able to understand the nature and consequences of the case against him.

Authorities allege Otto killed his mother, 48-year-old Carol Simon, and his 7-year-old nephew, Brayden Otto, in November 2016. Authorities say Heath Otto told police he strangled them and slit their throats because his mother was sick and his nephew was handicapped. He faces murder charges.

Otto was scheduled for trial in March, but a date will not be set until his mental health status is determined.

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Information from: Argus Leader, http://www.argusleader.com