Close friends Sturgis and Meo were last seen near the Doylestown area, CNN affiliate KYW-TV reported. Teens regularly circulated DiNardo's number, he told the newspaper.
Family members of the missing men are holding out hope.
"We'd still be looking for Jimi Patrick had we not made this agreement", Weintraub said.
Prosecutors on Friday charged 20-year-old Cosmo Dinardo with criminal homicide in the deaths of four young men who went missing in Pennsylvania last week, and they charged a second man with three counts of criminal homicide. Dinardo and Kratz returned to the property the next afternoon and used the backhoe to dig a hole and bury Finocchiaro, Meo and Sturgis, the complaint says.
DiNardo, who had run out of ammunition, then used the backhoe to run over Meo and haul all three bodies to one spot where they were buried in a common grave after he tried to burn the remains.
Weintraub held a dramatic midnight news conference to announce that remains had been found buried deep underground after four days of searching a farm property north of Philadelphia.
DiNardo, who was arrested Wednesday after trying to sell a victim's auto July 9, reportedly named a co-conspirator involved in three of the killings during his confession, who was then taken into custody Thursday, the Associated Press reported. In exchange for that confession, prosecutors agreed not to seek the death penalty against him.
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Authorities might never have found the fourth body unless they worked with DiNardo, Bucks County District Attorney Matthew Weintraub said.
"We are going to bring each and everyone one of these lost boys home to their families, one way or another", Weintraub said.
"As we are all deeply affected by this news, I encourage you to take care of yourself. I'd like to think that he wanted to help us get these boys home". The Bucks County District Attorney's Office did not respond Thursday to defense counsel statements; a briefing is scheduled for 11 a.m. Friday. DiNardo picked Kratz, his cousin, beforehand, and they drove to Finocchiaro's residence in Middletown Township.
DiNardo also told investigators where the bodies are, and sources tell FOX 29 the four young Bucks County men were killed over marijuana and a gun, after DiNardo felt threatened during a number of drug transactions. Weintraub's office would not confirm or deny media reports that Dinardo had implicated a co-conspirator and that someone in Philadelphia was taken into custody late Thursday night.
Investigators located Patrick's body Thursday.
DiNardo, whose parents own the farm, remained in custody on $5 million cash bail, accused so far only of a gun possession charge and trying to sell one of the victims' cars.
At the DiNardo farm property in Solebury, Finocchiaro is shot and killed and placed in a metal tank, which DiNardo called a "pig roaster". DiNardo was re-arrested on Wednesday after investigators unearthed a mass grave at the farmland his family owns. Patrick's body was discovered on a separate part of the property. However, court documents note, Kratz claimed Dinardo shot Finocciaro.
In February, police arrested DiNardo after they found him with a 20-gauge shotgun. Dinardo then shot Finocchiaro when he was laying on the ground, according to the affidavit.