Dorothea Helen Gray born Dorothea Helen Gray (January 9, 1929 - March 27, 2011) was an American serial killer sentenced to life in prison without parole. In the 1980s, Puente set up a boarding house in Sacramento, California, and cashed the Social Security checks on his mentally retarded and elderly guests.
Gray's reputation in the guesthouse was diverse. Some tenants complained about their stinginess and because they refused to give them their mail or their money; others praised her for her small acts of kindness or for her home cooked meals. Gray's motives for killing the tenants were financial, according to police estimates his income totaled more than $ 5,000 a month. The murders appear to have started shortly after Gray rented the home at 1426 F Street. In April 1982, a 61-year-old lady, friend and business partner, Ruth Monroe, went to live with Gray in her upstairs apartment, but soon died of a codeine and Tylenol overdose. Gray told police that the woman was very depressed because her husband was terminally ill. They believed him and concluded that the incident was suicide.
Gray had used sleeping pills to put his tenants to sleep and then suffocated them, and he hired others to dig holes in his yard.
He died on March 27, 2011 in prison in Chowchilla at the age of 82 from natural causes.