Cali was widely viewed as the leader of the notorious Gambino crime family.
Cali didn't think Comello was worthy of associating with a woman in his family, the sources added.
Wednesday's slaying of Cali sent shock waves through the neighborhood, which is considered one of the most exclusive areas of Staten Island.
The killing marked the first murder of a sitting mob boss in NY since the December 1985 hit on Gambino boss Paul "Big Paul" Castellano, who lived in the same neighborhood where Cali was shot. The Gambino crime boss was assassinated outside Sparks Steakhouse in Manhattan in 1985.
The 53-year-old was shot six times in the chest before being run over by a blue pickup truck, according to police.
Cali was home with family members when a truck hit a vehicle outside the residence, Shea said earlier in the week at a news conference. He was reportedly picked up at a New Jersey home by U.S. Marshals.
Comello's fingerprints were found on Cali's license plate, sources said.
"The investigation is still very, very young", the official said.
Anthony Comello is being held in a New Jersey jail and will formally charged with murder when he's extradited to the borough of Staten Island, where the killing happened, NYPD Chief of Detectives Dermot Shea said at a news conference.
Comello's Facebook page said he once attended Tottenville High School on Staten Island.
When asked about the suspect's arrest record, Shea said he "crossed paths in some limited circumstances with the NYPD", including getting a parking ticket on Staten Island the day Cali was killed. Without making further presumptions over the case, it might be worth reporting the details which have come to light since Frank Cali's death. His wife is the niece of purported mobster John Gambino.
Angel Gotti was referring to early speculation that her uncle Gene Gotti, just released from prison previous year, was somehow behind the hit, in some kind of power struggle. He had ALL screws lost!
Amazon Fire TV Apple Music Launches
Apple Music is now available on Amazon Fire TV , enabling customers to play music through their television using voice commands. First of all, you'll need to choose between the Amazon Fire TV Stick and it's upgraded sibling, the Amazon Fire TV Stick 4K .
Online Sports Betting Market Growth
Benefits With the market high, sports betting is an activity that receives a high level of support from online betting companies. More betters are opting to forego the long lines at the cashier's counter and the unavailability of their favorite machines.