A Pennsylvania mother who wanted to get revenge on her cheating husband is in police custody after allegedly killing her 18-month-old twins by drowning and smothering them, and attempting to poison their four-year-old sister to death.

Stacey Smalls, 41, is believed to have committed the crimes Thursday as she was in a jealous rage over an affair she thought her husband was having with another family member.

Her husband, Ron Smalls, returned to their home after work as a corrections officer and found the children's bodies and his wife with her wrists slashed. He frantically called 911 and told police his wife had killed the children and tried to poison their four-year-old daughter.

When police arrived at the scene they found the woman who told them: 'I harmed my babies.'

'The 18-month-old twins, Adam and Eve, were found limp and lifeless on a bed in the front bedroom. Police say they appeared to have died of suffocation.

Four notes next to the children read, 'This is why I killed your kids,' and detailed the mother's allegations of the husband’s affair.

'She had something she felt was justification but there is no justification,' Police Commissioner Charles Ramsay said. 'It’s a tragedy two young babies dead and there is no excuse for that.'

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