Authorities are investigating the case of a neighbor who allegedly shot a husband and wife, then retreated to his home and took his own life in a two-and-a-half-hour standoff that ended with SWAT blasting open his front door.

A New Jersey maniac shot his married neighbors Monday afternoon, then barricaded himself in his Jersey Shore mansion and committed suicide after a two-hour standoff with cops, authorities said Tuesday.

A husband and wife were gunned down outside their New Jersey home by a neighbor, who later died by suicide following an hours-long standoff with law enforcement.