A Brooklyn man likely died of natural causes before his body was dumped in a bin outside the building where he shared an apartment with his boyfriend — who is now accused of ditching the corpse, police sources said Monday.

Although no foul play is suspected in 33-year-old Darrell Montgomery’s death, cops arrested his boyfriend, Christopher Moss, 38, and charged him with concealing the corpse.

Moss was also charged with assault on a police officer and attempted robbery after he head-butted a cop and tried to grab the officer’s gun when police arrested him early Sunday after a tipster alerted them to Moss’ location about a mile from the home.

Construction workers found Montgomery’s body in a trash bag inside a large blue plastic bin near his building’s garbage area on E. 21st St. nea

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