alexander_yatch418@yahoo.com sent fake casheers checks in the amount of $4500.00 need help?

I beleave this is a scam through roommates.com tina olsen in st pete picked up real money in fla. family member out 4500.00 local police ?? yea - alex from scotland, living in england moving to usa sends casheers checks . say's keep rent money & send rest to fla western union for ship yard to pick up furniture to be but on truck by tina olsen #%^#^&$%^&#W%& no truck just tina gone with cash fron western union . now bank holds account for $4500.00 PLEASE HELP