The source spoke to The Associated Press on the condition of anonymity because he wasn't authorized to publicly discuss details of the case. After checking closely, they were able to identify one of the bodies.
"This is a homicide; make no mistake about it".
Authorities might never have found the fourth body unless they worked with DiNardo, Bucks County District Attorney Matthew Weintraub said.
Both DiNardo and the second person of interest have had run ins with the law in recent years. Patrick's murder occurred when DiNardo agreed to sell him four pounds of marijuana for $8,000.
Dinardo was released on bail on Tuesday when his father paid 10% of the $1 million bail in cash.
The commitment meant he was barred from possessing guns, but nonetheless he had one in February when police charged him with having a shotgun. DiNardo was allegedly stranded in the woods for a day after the crash and suffered a severe brain bleed. Weintraub said as part of his confession agreement, DiNardo told investigators where to find Patrick's body.
The gruesome discovery is the latest development in the search for Finocchiaro, Jimi Tar Patrick, 19; Mark Sturgis, 22 and 21-year-old Tom Meo.
One of the victims is 19-year-old Jimi Patrick, a Loyola University Maryland student.
It is the result of this discovery of Cosmo Dinardo would have happened to the confessions. Authorities said they've found human remains in their search for four missing young Pennsylvania men and they can now identify one victim.
Several law enforcement agencies were unhappy with the sad incidence.
Asked why he thought DiNardo chose to confess, Weintraub said, "I don't know what convinced him, I'd like to think he wanted us to get these boys home". "They don't do this for glory or recognition, they do it because it's their job".
The following day, Dinardo told police, he and Kratz returned to the property, where Dinardo used the backhoe to dig a deep hole and bury the tank containing the three bodies, the affidavit says.
Asked whether DiNardo's information was critical to finding the body, the district attorney told reporters: "We'd still be looking, I know that much".
The location is less than 2 miles from the location where Meo's vehicle was found in the garage of DiNardo's parents property on the 2800 block of Aquetong Road and less than a mile from where Mark Sturgis' vehicle was found in Peddler's Village, which is a tourist destination. He added to say that they don't have the habit of picking up someone and starting to build a case around him or her.
He was released after his father paid a bond but then rearrested on 12 July accused of stealing and trying to sell a auto, found on the farm, belonging to Mr Meo.
In his confession, Dinardo detailed a series of shocking killings with no clear motive. Kratz has yet to retain legal counsel who could comment on his behalf. "Everybody you talk to about this guy, you hear he's mentally unstable".
DiNardo gave Kratz a Smith and Wesson.357 handgun, which belonged to his mother. Twenty-year-old Cosmo DiNardo of Bensalem has confessed to "participating in or committing" the killings, his attorney said.
An attorney representing the couple issued a statement earlier on Wednesday (Thursday NZT) saying they sympathise with the families of the missing men and are cooperating "in every way possible with the investigation".