Mom enters plea in babies' deaths

• Three of Erica Murray's seven children were found dead in her home in September


• She was charged with the murder of two of the infants


• Police wore hazmat suits as they cleaned squalor from home

(CNN) -- A mother whose infants were found dead amid squalid conditions in her Massachusetts home pleaded not guilty Monday to two counts of murder and other charges.

Erika Murray, 31 showed no emotion as she quietly answered "not guilty" nine times in Worcester County District court as the charges were read out loud.

Besides murder she is charged with neglect, abuse, reckless endangerment, concealing a fetal death and even animal cruelty.

It took police officers in hazmat suits to retrieve the bodies of three infants found in September, amid what police described as filth and squalor at Murray's house in Blackstone, a town on the Rhode Island border.

Four other children belonging to Murray also lived in the home and were removed by the state in September.

Squalid Mass. home quarantined

Her boyfriend, who lived with her, also faces charges but not as serious as the murder counts against Murray.

Ray Rivera, 38, was indicted on two counts of assault and battery on a child causing substantial bodily injury, two counts of reckless endangerment of a child, two counts of cruelty to animals and one count of cultivating marijuana.

His attorney has said that he absolutely denies the allegations.

Father says he was unaware of the children

Both Rivera and Murray maintain that he not only never knew about the three infants he fathered that died in his home, he also was somehow unaware of two of the four living children removed from the 1,150-square-foot home.

DNA tests determined that Rivera is the father of all seven, according to CNN affiliate WHDH.

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