Wanting to contact wife of bfather - again

About 11 years ago, I had learned by bfather died of a heart attack by way of a returned Christmas card and a letter attached from his co-worker. Since I was never allowed to contact his house during our brief 2 year reunion, both years we did not meet each other in person, I was only contacting him through his office address and office email. Upon learning of this, which was several months after the fact, I wrote his wife a condolence letter, and going into some detail of our 2 year brief contact with each other, how he would send emails with updates on what his sons (my half-brothers) were doing, and some news of some trip they were taking, whether it was a ski trip or some soccer trip. Anyway, I tried to open the line of communication with her. I was positive in my tone, but I suppose she wished I was dead as well because she had never responded to me. I told her in the letter I would not try to contact her, more out of respect of her privacy, but not one little card in return saying "Thanks but no thanks." Years have gone by, I have moved, changed emails, now have 2 daughters, and have been living with the fact that I have heart disease. I had open heart surgery 7 years ago - surgery to correct a congenital heart defect which I believe he had too. I know my bmother did not have this, so it has to be his side of the family. Perhaps his wife knew of this particular ailment, perhaps not. If anything, I wish to contact her again just to let her know about it, like a warning for her family. I believe she is married again, but would have to investigate it further. I was thinking about contacting half-brothers but like that would ever happen very well. Just want some advice on this touchy subject. :confused: