Minh Nguyen, a co-founder of Plaxo and a techie who was involved in several other startups, was arrested and charged with murder after allegedly shooting his ex-wife's new husband in Virginia. Police say Nguyen's ex-wife was returning home with one of the kids when the attack took place. Two other kids were in the house at the time. NBC reports Nguyen and his wife had gone through "months of strife" over "child custody and visitation issues."