Russo is a friend of the man charged with killing Amy Giordano. The 27-year-old single mom vanished after shopping for groceries with her married lover and their toddler.
The lover, Rosario DiGirolamo, is being held on $1 million bail on a murder charge.
In court Friday, prosecutors said Russo helped clean up Giordano's apartment after she was beaten to death and dismembered. They also said he met DiGirolamo at the Staten Island pond where skeletal remains were found inside a suitcase.
Russo's lawyer says information from his client led detectives to the pond.
Authorities are awaiting DNA results to identify the remains.
