A Prince George's County grand jury yesterday indicted a New York woman on first-degree murder charges in the deaths of two persons whose badly decomposed bodies were found May 5 in their Temple Hills home.

Ann Marie Spence, 27, an unemployed beautician, also was indicted on attempted murder and attempted poisoning charges in the deaths of Dennis White, 33, and his 15-year-old daughter Donna.

County police said Spence, White's former girlfriend, told homicide investigators that she had mixed a household oven cleaner and cocaine into food that was apparently eaten by the Whites.

When police arrested Spence, she was charged with two counts of attempted murder, pending the medical examiner's ruling on what killed the Whites. But the Maryland medical examiner's office could not find evidence of the corrosive oven cleaner in either body and said the caused of the deaths was "undetermined."

Prince George's State's Attorney Arthur A. Marshall Jr. said his office has asked a private laboratory to run chemical tests on the bodies to determine whether traces of the oven cleaner are present.

Several days after the Whites' bodies were found in their home at 5319 Old Branch Ave., police investigators found more than $1 million in cash that police say was earned through illegal drug deals.