A friend of mine and myself moved into an apartment on 9/1/05 and signed a one year lease. on 9/1/06 our lease ended but we stayed there for another year without signing a new lease. in the begining of september 2007 (first or second week) i notified my roomate and the landlord i would be moving out at the begining of october.I paid rent for the whole month of october and moved out in the first week.his cousin moved in at the start of november. the problem is that i never got my security deposit refunded.i spoke with his cousin at the begining of december about the security deposit and she said she would have it shortly.Then she said she'd have it in april when she gets her tax refund. 3 more letters and countless unanswered phone calls i still don't have my security deposit. i was recently laid off and could really use that money. who's responsibility is it? the landlords or the newer tenant. i live on long island in nassau county. help please.