A woman was fatally stabbed and her teenage son was badly hurt after her beau allegedly attacked them with a knife Saturday morning in the Bronx, cops said.
Yesenia Hall, 42, was stabbed in the neck and torso and her 16-year-old son in the neck and back around 6:30 a.m. in their apartment on Sherman Ave. in Highbridge, according to police.
The 45-year-old maniac who allegedly attacked them changed his clothes after the bloodshed and fled, authorities said…