Can't Remember Movie Name?

Rich man hires ex convict(prisoner, murderer) to spy on his wife because hi suspect she is cheating (blonde) on him. As time goes by they fall in love. He almost caught them together because his dog-tags fell in bed after making love. They make a plot to rob him and ran away, but husband is back earlier from businesses trip and after quarrel he kills her(she is in bathtub laying in blood). Ex con after finding out what happened kills(or try to kill him- can recall ) husband. During movie there are short scene of woman laying in bed (or bathtub) and blood transfusion. As movie unravels it turns out that wife collected her blood in order to organize her own false murder (to get rid off husband and ex con - husband killed by ex con and ex con in prison). So she could runaway with her true lover which is gardener.They flyaway and movie ends.

Cant remember actors but think that rich man resembles (Alec Baldwin, Michael Madsen or Steven Seagal) and ex con (William H. Macy or David Caruso). Those actors only resembles in my memory which doesn't needs to be true.