[Paleo Conservative]

Don't know, but I'm going to hazard a guess and say the the cops tested the finger's DNA and found a bunch of alleles that matched those of the woman.

Also if the aunt was related through the maternal line, the mitochondrial DNA should be identical. The mitochondrial DNA is located in the mitochondria not the nucleus, and humans gets all their mitochondria from the egg cell and none from the sperm that formed the zygote are the original source of all the body's cells.

[GoLightly]

Aren't there only something like 7 mitochondria lines in the world?