U.S.A: New York: Couples discover decomposing corpse in there newly rented apartment

Couples from Bronx, New York were led to a decomposing body wrapped in plastic and sheets in a cupboard in their newly rented apartment with a note apparently left by the killer that reads:
"sorry for the smell"
The decomposing body was later confirmed to be 64 year-old Sidney Harris; he lives in the apartment.
The apartment was only rented to the couples when nobody knew of his (Harris) whereabout.
A neighbour of Harris said he thought Harris went to the hospital.
Preliminary report suggests he died from multiple skull fracture.
A murder investigation is underway.