Police say the man facing charges that he killed the parents, grandmother and uncle of an infant found left in a western Tennessee yard last week has been arrested.

Before the arrest of Austin Robert Drummond in connection to a July 29 quadruple homicide and abandonment of a baby, three other individuals were also arrested.

At the news conference Tuesday, Tennessee Bureau of Investigation Director David Rausch said the suspect’s girlfriend was related to the victims. Goodman later confirmed to CNN Drummond’s girlfriend and Rose were sisters.