No mention if the resulting child has genetic damage because of the incest. Neither is there any mention about whether her brother paid any consequences for his crime.
First, no one died.
“The truth over Ms Middleton’s child eventually came to light and her brother was jailed for four years in 2009 after DNA tests proved he was the father.”
depends on the degree of separation...
A group of genetic counselors reviewed the research on the biological consequences of sex between relatives (link at source for pdf file of study). They found a surprisingly small increase (about 4 percent) in birth defects among the children of married cousins. Incest between first-degree relatives, however, was a different story. The researchers examined four studies on the effects of first-degree incest on the health of the offspring (including the Czech research). Forty percent of the children were born with either autosomal recessive disorders, congenital physical malformations, or severe intellectual deficits, and another 14 percent of them had mild retardation. In short, the odds that a newborn child who is the product of brother-sister or father-daughter incest will suffer an early death, a severe birth defect, or some mental deficiency approaches 50 percent.
http://www.huffingtonpost.com/hal-herzog/the-problem-with-incest-e_b_1946901.html