Updated 6:08 p.m.

A Grand Jury has indicted Albrecht Muth on the charge of first degree murder in the death of his wife Viola Drath in her Georgetown home, WJLA reports. Drath, 91, was found dead in her home in August of 2011, a medical examiner determined that cause of death was strangulation and blunt force trauma.

According to the indictment order obtained by WJLA, a grand jury indicted Muth with aggravating circumstances:

"the murder was especially heinous, atrocious or cruel" and "the murder victim was especially vulnerable due to age."

Muth was charged with second degree murder in August, but the charge was elevated to first-degree murder "based on evidence presented to a D.C. Superior Court grand jury," according to The Washington Post.

Muth was recently transferred to St. Elizabeths psychiatric hospital in Washington, D.C. for a full mental evaluation. On Mar. 14, he will face arraingment and a competency determination.