Bergen County prosecutors say 34-year-old Michael Brady of Teaneck stabbed 41-year-old Tam Marie "Tammy" Pitts-Gaddy last week during an argument in her apartment in Englewood.
They say he then used a plastic bag to smother her 5-year-old daughter, Natasia Gaddy, because she had witnessed her mother's slaying.
Brady remains jailed on $2 million bail. He's pleaded not guilty to charges of murder, hindering apprehension and weapons offenses.
Prosecutors say Brady and Pitts-Gaddy had dated for the last three years and lived together at times during their relationship.
The homicides were the first in Englewood this year.
Get Eyewitness News Delivered