PHILADELPHIA - A WOMAN who conceived several children through an affair with a man unaware of her pregnancies was charged on Monday with homicide after tests on remains found in coolers or encased in concrete showed at least four infants were born alive but killed, authorities said.

Michele Kalina, 44, kept the remains in her closet until her husband and daughter found them in July, authorities said on Monday.

Kalina, a nurse's aide, also bore a daughter from the same affair in 2003 but gave the baby up for adoption, authorities said. She and her husband have a teenage daughter and had a 13-year-old son who died in 2000 after a long illness.

The husband and daughter found five sets of infant remains in a closet this summer in coolers, one of which was filled with cured cement, police said. At least four of the babies were born at or near term, then killed in a manner consistent with asphyxia, poisoning or neglect, authorities determined.

Kalina will be held without bail pending a preliminary hearing scheduled for Thursday. She has been in custody since August on abuse-of-corpse charges. Her public defender, Holly Feeney, declined to comment Monday after Kalina was arraigned on criminal homicide, aggravated assault and other charges.

Kalina denied that she had had any other children or pregnancies until confronted with the adoption paperwork, police said.

5 baby remains found in home