Derek Puffer, who is 35, had a bandage on his head when he briefly appeared in court on Monday.
The lawyer representing him just for the day told the court there was "some concern" about his fitness to stand trial.
Puffer is charged with second-degree murder in the deaths of Billy Powers and his wife Donna Lee.
The couple was found stabbed to death in their bed in their home on Thursday.
Police say Puffer was living with them, and was Donna Lee's adopted son from her first marriage.
Puffer is set to return to court on Aug. 7.
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