murphy: then there were the letters swain wrote to mary basler, some of them before his wife's death.a particular playmate to join him in vermont. he calls her "soul mate mary." another he signs, "with all my love, david." most ominously, this one dated five months before shelley's death, which reads, "life has definitely gotten more complicated. i'm wanting to be with you, but i can't change this mess i've got anytime soon." why not just divorce? because their nuptial agreement prevented either david or shelley from receiving money from the other of they parted ways. but the prosecution said swain saw another way. mr. williams: under the will, if she died, he benefited from her entire estate. murphy: in fact, with shelley gone, david would get the dive shop, the money, and the girl. just two months after his wife's death, he and mary basler started dating. murphy: and, in fact, they became a couple following shelley tyre's death. mr. williams: yes, they did. and for, i believe it was a year and a bit, and then she broke it off. murphy: lastly, williams also brought to the stand a tri