Ricardo Santiago, of Millville, pleaded not guilty Thursday after he was arrested Tuesday night and charged with homicide.
Police say Santiago led officers to the bodies, which were found at a boat ramp at 666 Back Neck Road in a rural part of Fairfield Township, Cumberland County.
According to the prosecutor's office, Neidy Ramirez was strangled with a cord of some kind and buried under a pile of leaves.
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Her daughter, Genesis, was found some distance away. Officials said she died of a crushed chest and suffocation.
Ramirez's family wept in court as they heard the grisly details of her death.
She leaves behind two young sons, ages 5 and 8. Santiago is the father of one of them.
Santiago is being held at the Cumberland County Courthouse on $2 million bail.
The Associated Press contributed to this post.