Prosecutors narrowed in on DNA evidence on day seven of Brian Walshe’s trial, with witnesses detailing the process of analyzing samples from blood-stained slippers to a hacksaw and hatchet.

“The DNA profile from this item is at least 30 nanillion times more likely if it originated from Ana Walshe than if it originated from an unknown, unrelated individual, and this provides support for inclusion of Ana Walshe to this DNA profile,” said Salman Saleem, forensic scientist 3 in the DNA unit at the Massachusetts State Police crime lab, speaking of a stained area on the blade of a hacksaw.

Forensic specialists spoke to the lengthy process of DNA collection and analysis on Tuesday in Norfolk Superior Court, where Brian Walshe stands trial on charges he killed his wife before dismembering and di

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