WASHINGTON (AP) — A German-born man accused of killing his much older wife in Washington’s fashionable Georgetown neighborhood has grown increasingly anxious and remains mentally incompetent to stand trial, according to doctors who have examined him.

Albrecht Muth is awaiting trial in the August killing of 91-year-old Viola Drath, a German journalist and socialite and his wife of more than 20 years. But the case has been on hold for months amid concerns about Muth’s mental state.