Suspect in Death of DC Yoga Teacher Charged With Murder

Tricia McCauley, 46, an actress and yoga teacher, was found dead in her car.

The cause of death was "asphyxia due to ligature strangulation with blunt force trauma," the Metropolitan Police Department said today.

The suspect, Adrian Duane Johnson, aka Duane Adrian Johnson, 29, of Upper Marlboro, Maryland, has been charged with first-degree murder, as well as second-degree theft and simple assault, the police said.

D.C. Chief of Police Peter Newsham said police do not believe the suspect previously knew McCauley.

When McCauley died was unclear, Newsham said at a news conference this morning.

He called today's news conference "excruciatingly painful" for her family and friends.

ABC News' Lucien Bruggeman and Stephanie Ebbs contributed to this report.