The contractor has a connection to the minivan and to a mysterious cellphone found strapped underneath Stark’s car, apparently used by the abductors as a tracking device, sources said.
Investigators also have been able to track the cellphone of one of the suspects in the area where the body was dumped, a law-enforcement source told The Post.
Complicating the case has been what sources described as Stark’s long list of possible enemies, ranging from jilted business associates to tenants.
Stark’s autopsy revealed he died of compression asphyxiation — which likely happened when his kidnappers sat on him during the brutal attack. Sources believe his kidnappers probably did not intend to kill him.
Detectives are telling the family that an arrest is imminent — before Passover on April 14, or immediately after the eight-day holiday, a source said.